i recently asked a similar question on the anime 
chaos board, so here's the ones that i know of:

1. celga
http://www.celga.com/

2. rinkya
http://www.rinkya.com/

3. hobby shop k
http://www.hobbyshopk.com/

4. sato
http://www1.winknet.ne.jp/~cel/index.htm

hope these help,

haruna
haruna.of.jurai
haruna@planetjurai.com