I'll take a stab at it, though don't count on my being completely right, others will sound in on this I'm sure..
If you aren't selling the control panel, then fine, include the harness with the board and drive, you won't need it (unless you have 49-ways, they would help with wiring at that point..)
Power supplies are fairly generic on those cab's, so don't expect to get much more than say $20-25. Heck, I'd hang on to it to power LED's, etc.. if you pimp your Mame cabinet out!
Total price on the board and drive, expect anywhere in the range of $30-$65 before shipping as long as you can prove it's working..
As I said, don't treat what I say as the bible, but there's my opinion anyway
