Thanks to secretanchitman on AnandTech for posting this:
secretanchitman said:in-store only. credit goes to NeoGAF and CAG for finding the deal first!
toys r us comes out with booklets around the year that are filled with coupons. this months coupon has one that gives $10 off either the ps3 or 360 version of mortal kombat. its valid until may 15th i believe. however, starting sunday may 1st, mortal kombat will be on sale for $39.99 ($20 off after almost 2 weeks of being on sale!), and so using the $10 off coupon from the booklet will make it $29.99!
i bought my copy today for $49.99 and am getting it pricematched next week down to $29.99 (after next weeks $10 discount and the $10 coupon).
the booklet you need to look for either has michael jackson on the front cover or a black nintendo 3DS with three lego star wars characters on it. my local toys r us store only had the old booklets, but the next store i went to had tons of the new booklets on hand.
on another note, the person at the video game counter knew *exactly* what i was doing, and was totally happy i knew about it. he was waiting for more ps3 copies to come in - apparently more people are buying the ps3 version than the 360 version, probably because kratos is an exclusive character.