I rented a copy from Blockbuster By Mail. Pretty sure Gamefly has it too. It'd be worth the monthly fee to get this and a few others with easy achievos.
100% Arcade  | 100% Retail 
20k on 12/19/10 | 30k on 06/27/11 | 40k on 06/16/12 | 50k on 06/30/13
Sig courtesy of DethHolly.