RUG/Pennsylvania/State College/Electronics/RAMPS
Since the RAMPS electronics seems to be one of the best bets for the alternate electronics on the PRUSA repraps this is a compiled list of where to purchase and the cost. some of these are from america and other company's are not
the company ULTIMACHINE seems to be the best bet for cheap electronics in the US. also purchasing the stepper controllers from them also seems like a good idea as they come with heatsinks for only $1. I would recommend purchasing the unassembled kit
pololu needs heat sink ultimachine sells them for 1.50 or 14 for board and heatsink for 14 might be best choice kits
http://ultimachine.com/content/ramps-pre-assembled-kit-complete $200 everything 4 steppers, and end stops
http://ultimachine.com/content/ramps-pre-assembled-kit $85 the board fully assembled
http://ultimachine.com/content/ramps-diy-kit-complete $162 unassembled kit but has pololu and end stops
http://ultimachine.com/content/ramps-diy-kit $50 just the board and electronics
http://ultimachine.com/ramps $10 this is just the ramps board no electronics
http://reprapsource.com/shop/show/6603 49.9 Euros built
http://xyzprinters.com/23-ramps 7.97 Euros board 30.67 Euros electronics 72.26 Euros ramps everything unassembled 33.60 Euros ramps board un assembled
https://shop.grrf.de/electronics-c-68.html also sells the pcb but also Euros