4 player kit (all controls and interfaces) for $299
http://cgi.ebay.com/4-Player-Home-Arcade-Kit-W-I-Pac4-Comp-W-MAME-TM_W0QQitemZ6266929029QQcategoryZ13718QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
He does 4 player panels too. My order for a custom 2 player panel (36" X 13") was $78 + shipping. I also ordered sticks, buttons and overlay from him and the entire order came to around $150 shipped. His panels are CNC cut, same with the lexan. I am having him do another small panel after this one is done for a mini machine (20" X 6")!
Tell hime Erik sent ya, maybe he'll give me a discount 
Toonces
Looks like that price doesn't include the box itself, just the "guts"
Hmmm...is it really that good of a price, not much different than buying direct (except maybe for shipping)
Ipac4, USB board and Feet - $68.00 (Ultimarc)
4 Happ Competition Joysticks - $13.95 each -$55.80 (Happ Controls)
28 Happ Concave Buttons - $1.85 each - $51.80 (Happ Controls)
4 (1-4 player) buttons - $2.30 each - $9.20 (Happ Controls)
3" PS2/Beston Trackball - Happ Version $102.90 (Happ Controls)
Button Nut wrench - $2.50 (Happ Controls)
Wiring kit - $19 (Ultimarc)
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Total (Buy direct)- $309.20123Gumby123's price - $299
I haven't dealt with the guy, so I can't say if his stuff is any good or not, but doesn't seem like much of a savings to me....I might check with a couple other guys on this board....I want to say PONYBOY and DIVEMASTER both sell parts, and have gotten good reviews from the folks on this forum (again, no personal experience).
To the guru's...If I missed anything, please let me know. I'm a noob, and I'm getting ready to purchase the parts for my first panel. I'm planning on building one of these myself, and want to make sure I got the prices right.
Thanks,
PCTech