[quote name='djricekcn']If you don't mind running ISO (fyi: iso aren't for pirating either, even though majority do...i play ISO for two reasons Faster loading usually and less stress / longer life for the machine usage - and yes, i own my games), PSP GO can run ISO now and the M2 Memory Sticks are damn dirt cheap, a lot cheaper than MS Duo. So, buying PSPGO might be a smarter choice if you don't mind ISO[/QUOTE]
A quick search around the web shows very little difference in price between the two (MS duo vs. M2). Unless you're looking to buy from a shady vendor or marketplace vendors on Amazon or Buy.com, I don't see the price difference that you mentioned.