If there were any Toys R Us around I'd do that, but ALL of them within a reasonable driving distance have gone out of business. I'll get both, but a free $20 is pretty damn good insentive to pre-order.
So the Toys 'R Us deal is only $4.10 better. And how valuable is a $50 gift card at TRU on their typically overinflated prices nowadays anyway?
And keep in mind your immediate out of pocket expense is about $16 higher with TRU.
Nevermind that at $3-$4 gallon you'll likely offset that cost in your roundtrip to TRU assuming you even have one nearby. Mine happens to be about 11 miles away, so almost exactly a gallon. And if you don't spend that TRU gift card immediately... more gas for the next trip!
Plus when you do finally spend that $50 TRU card, you'll have to pay tax on whatever you buy with that gift card.
kmart offers a $15 gaming coupon with the purchase of any gaming software totaling $40 or more. Also, if you spent $120 on gaming software (which could be mortal kombat and portal 2), you receive a $60 coupon back. Also, for buying either one of those games, you get $10 off a $20 PSN card. So if you just bought mortal kombat, you would get a $15 gaming coupon and $10 psn card worth $20. There just isnt an exclusive costume offerer