Well, that's the _old_ GROPOS page which came out before the game did but had better pictures so that's is the link I gave ya. Here's the stocklist:
http://www.agentsofgaming.com/b5wstock.htm#gropos But AoG went out of business of course, so not even the main Centauri army book was released. Bruce, one of the former owners of AoG is still seeling some B5Wars + other stock from here:
http://b5wars.net (check out the general forum, under "would anyone buy miniatures") I think he still has some gropos, or else you could also check out eBay.
I know someone was also making a B5 convesion for Dirtside II, which is a ground combat game available as a free download from
Ground Zero Games I dunno, GROPOS was a pretty fun game, I have all the books and couple of companies for Minbari + Earth Alliance. I played a few games, but unfortunately not too many as my main opponents now lives elsewhere and is rarely in for a game.