[Update: Our friends at CheapAssGamer.com say that Amazon.com are also matching the buy two, get one free offer. Nice!]
Select PlayStation Vita games fall under a promotion that has you getting one free after buying two. It seems that only Sony published titles are eligible:
Not a bad deal! GameStop says that this offer is open from now through February 25th.
A recent Target flyer points to the bullseyed retailer offering a similar dea, but it seems that they're being dicks about it and not honoring the offer in some stores. If that's the case, go to Best Buy with the flyer, as VentureBeat says that they'll match the deal. Note that the Target/Best Buy offer extends beyond games published by SCE.