I've got a GBA promo lot on ebay. It contains a GBA SP Polo shirt, a GBA SP Visor, and a freaking awesome GBA SP Light-up neon neck pendant. They are going for next to nothing.
http://cgi.ebay.com/ws/eBayISAPI.dll...ESSE%3AIT&rd=1

I've also got a Phillips CD-lot that is going for next to nothing. It contains the system, games, and even the gun which is hard to find. Check it out.
http://cgi.ebay.com/ws/eBayISAPI.dll...ESSE%3AIT&rd=1

Thanks,
-crispy