There have been a few threads on this indeed (a lot of which I haven't read). The answer is really pretty obvious: you'll want to charge enough to be able to pay your bills, and in the end maybe even make a little extra, rather than operating at a loss. For instance, you could calculate and/or estimate your annual…
Happ controls (now known as Suzo-Happ) sells authentic and brand-new parts for arcade cabinets. http://www.happcontrols.com/ I've bought from them before when assembling my own arcade cabinet. The buttons and sticks I got from them worked very well for years. (in fact, I still have them and they still work great, planning…