The first watchfulness in finding resources is to limit expenses and the cost of time. You can do this by
(1) not leaving your desk and (2) not leaving your town.
(Expansion on point 1) By not leaving your desk, I mean using your computer and the Internet to gain information on the Grenada Revolution. Primarily this is done through search engines and through links found at Grenada-related WEB pages.
(Expansion on point 2) By not leaving your town, I mean to use the main branch of your local public library and your local college library facility. If you make friends with the people at the Reference Desk of your local libraries, most likely they will give you the password to hook on to the World Catalog, through OCLC First Search, where there is a wealth of information.
Let us say, you are in the United States. You want to borrow a copy of Vijay Tiwathia's, The Grenada War: Anatomy of a Low-Intensity Conflict. If you looked up the title on firstsearch.oclc.org [a password restricted site—ask your local reference librarian about this] you would see that the book is held in 81 libraries in the US, Canada, EU and Caribbean.
Most likely, your local library can order the title you seek through the Interlibrary Loan (ILL) system. The book may come from the Wake Forest University Library in North Carolina, for example, and be shipped to your library via ILL. You are notified of the book's arrival at your local library. You pay a nominal fee ($3 or so) and you can take the book home to study; returning the book within the specified time. The first time this happens you may feel that this is the best thing since rural electrification.
Most likely a similar service is available in the EU countries, in Canada and in the Caribbean, especially between University of the West Indies libraries. In Grenada, you can walk to the Marryshow House Library or the Grenada Public Library - now air-conditioned/humidity-controlled.
You may want to purchase the selected collection of Grenada Documents the United States removed from Grenadian soil so you can have the documents as a continuously available reference. To read more about this volume, please link to The Grenada Documents.
The U.S. government-issued "Grenada Documents: Overview and Selection" is usually for sale on the used book market as are other Grenada titles. Link to AddAll Books. This one-stop site is a maxi-service WEB site for small booksellers who have consolidated their listings in service sites; for example, one service site is ABE Books. Check out Book Price Comparisons to determine the location where cheapest price is listed.
When searching on these sites for books on the Grenada Revolution, a practice more comprehensive and practical is to search only on Grenada. Yes, you may get Grenada Publishing in the UK, or Grenada, Mississippi titles or Granada in Spain, but these are usually a small percentage of the books found (usually about 300-500 are for sale about Grenada at one time). Think like a bookseller who is writing up piles and piles of books - What is the keyword? Grenada is a likely choice.
When you order through these sites, unless you use the various payment plans of the consolidator sites - like ABE Books - you can order directly from the bookseller. I usually email my interest, confirm the cost of the book and the shipping and the total price. I ask them to confirm the stock situation and get back to me. When the bookseller responds to my request for confirmation, I usually email them back that a check is in the mail. There are various ways to do this. Keep in mind that the bookseller could be a person like myself, selling off my collection. I am not at ease sending off my credit card information other than to a larger, secure organization.
Let's say you want a new book on Grenada, still in print. Check out AMAZON, AMAZON UK and/or BARNES & NOBLE. There are other places to order books online. Their service and viability change enough to keep you on your lookout for the best places to order books on the Internet.

Marryshow House
©2002, photo by Ann Elizabeth Wilder
If you are in St. George's, Marryshow House on Blaize Street, formerly Tyrrel Street, has extensive research materials on The Grenada Revolution.
The Sheila Buckmire Grenada Public Library is a place to check-out.

Grenada Public Library, 2003
Photo courtesy of Brian Steele
Likewise, if you are in New York City, explore the Schomburg Collection.
If in Washington, DC there are many choices - Georgetown University, Howard University, the Library of Congress, among others. Visit the original Grenada Documents in microfiche form at the National Archives in College Park, Maryland. The University of Florida in Gainesville and the University of Texas at Austin have extensive Caribbean Collections.
Resources surely abound in Canada and the United Kingdom. In the UK, try COPAC.
Visiting research collections on-site requires the important step of inquiry beforehand for hours of service, requirements for qualifying the researcher and investigation of whether resources are available to meet your needs. Have you allocated enough time to get everything done? Better yet, do you have specific goals to meet [because Murphy's law is that you will never get everything completed]? Do you have pre-written citations you wish to explore? Is the library air-conditioned, and how long can you research before you've had enough? Is there a place to get refreshments?
At one time I would have advised you attempt a Freedom of Information Act (FOIA) request. I received documents, eventually, following my request in 2000. Former Attorney General Janet Reno had a 1993 directive that urged agencies to make discretionary disclosures. If there was a question someone would be harmed, the request would not be granted. In general, during the years following 1993, most requests were granted. The period was a time of discussion about too many documents being marked secret and unavailable to the public, even though those documents were without harm to anyone and contributed to the historical record. There certainly was an easing about giving out copies of governmental documents.
It appears, since the appointment of Former Attorney General John Ashcroft and as of 12 October 2001, a new memorandum has been issued. The wording of this memo discounts anything Reno issued and endangers the granting of a FOIA request about Grenada. You most likely have heard in the news about the Exemption 5, which relates to working papers. As Kirtley states in her American Journalism Review article of January/February 2002:
. . . the most obtuse government-records custodian couldn't mistake the message:
When in doubt, don't give it out.
And it further appears there are additional restrictions on U.S. government information. Consider this report from The Hightower Lowdown, of May 2003:
On the night of March 25 [2003], with none of the fanfare that usually accompanies a major policy decree, George W. issued a 10,000-word executive order that:
(1) gives the government more discretion to keep information secret indefinitely, as long as it's for 'national security';
(2) gives the vice-president, for the first time, power to classify government information as secret;
(3) treats all routine material sent to American officials by foreign governments as secret;
(4) expands the ability of the CIA to keep its records secret;
(5) delays the release of old presidential records that would have been declassified automatically after 25 years.
Good luck and have fun with your searches.