I'm also supplying shells and boards to developers and independent publishers. I don't have a website up for it, but most of the info is here:
http://forums.nesdev.com/viewtopic.php?f=4&t=12716My cart shells are translucent grey, I also have black ones. Until I have an online store up, my boards and shells can be bought either from SoleGooseProductions on NintendoAge, or directly from myself.