The following sites are ones that I frequent. They are up-to-date, informative, and you might find something that you want there.
BANZAI -- The Japanese rifle and militaria collector’s headquarters.
http://www.gunboards.com/sites/banzai
For excellent discussions on Japanese rifles and such, you are invited to the following two sites.
http://www.castle-thunder.com/wforum
If you
are interested in Japanese pistols, you will want to visit Nambu World: Teri’s WWII Japanese Handgun Website
at
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http://members.shaw.ca/nambuworld/
If you collect grenades, this site is a must.
There you will find reference material, buy/sell, Q&A, repro alerts, articles, and more.
This site specializes in British and empire historical arms.
It is packed with information and has top-notch reference material for sale.
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Jim Dawson, author of the excellent book Swords of Imperial Japan 1868-1945, has a web site where you can find “military books and militaria” for sale.
If you are interested in U.S. grenade launchers too, check out this site.
There you will find U.S. militaria and reference books for sale.