tonight i stopped at Kmart, just to look around. I don't go there that often, but every now and then i pop in to see what i can find. i was looking through the video game section, and I found this:

for $15. i know that the wiimote works as a lightgun in mame, do a limited extent. i know that there are issues with getting it to automatically sync, but i can only hope that this will get fixed in time, so i picked one up...i figure, either way, i can use it with my wii until everything is sorted out on the PC end.
then i went back through the toys, and they had a clearance rack, where i located this:

it is a golden tee game that you plug into your TV. i found an article online where someone did a mouse hack on one of these, so i had to pick one up. it was on clearance for $20...and even better yet, when i went to check out, it rang up as $12.99.
so now i just have to see if i can locate a USB ball mouse. i have some ps2 ball mice, but i would rather go with USB if i can. i already have a 3" wico trackball for my cabinet, but i figure this thing would be perfect for use at my other PC for when i'm playing around with mame stuff. ( i have to get my centipede fix)
i'll keep you guys posted with the trackball mouse hack project over the next few days.
i just wanted to let you guys know that i found these at great prices, so if any of you are looking..go check out Kmart.