This site provides one of the best search engines ever. It includes a large number of member dealers and bookstores. Virtually every collectible Tolkien book is available on this site. Click to link: Antiquarian Booksellers Association of America
If you are searching for old books or calendars, try this site:
THE SWORD OF EOWYN
A very high quality, beautiful sword. This would make a great decorative gift for the shield maiden in your life, or someone who just loves equestrian design.
LORD OF THE RINGS JEWELRY
Now that the movies have largely run their merchandising course, this may be the best time to purchase high quality jewelry at discounted prices. Use these as gifts for years to come.
LORD OF THE RINGS GAMES!
It appears that any game that could possibly have a Lord of the Rings theme has been produced. These include Monopoly, Trivial Pursuit, Backgammon and Dominoes.
LORD OF THE RINGS FIGURES
Figures from the movies include a large action figure series. There are separate figure sets and color schemes for each movie. The highest quality figures were made by Sideshow WETA. Although these are expensive, they sell out quickly and will likely keep their values.