Here are some things that I have on my list that I'd like to shop around for.
Saturn S-Video Cable
Saturn Action Replay Pro 4-in-1
Dreamcast VGA box
Dreamcast Arcade sticks
Official Dreamcast Controllers Non-Gray
Pal Dreamcast (blue swirl)
Official N64 Controllers, any colors but with a good analogue stick
N64/SNES/GC S-Video Cable(s)
Send me a PM if you have any offers.