IPhone Buy Back Through Target?

My daughter and I went to the store and tried the same thing with a cracked screen. We were told we would get $13 back because of the cracked screen. The guy in the store told us to go on eBay and order replacement screen and tools for like 10 bucks and fix the screen myself. Without the crack in the screen target would give $130 for the 3GS. I did the screen replacement and it cost me only $5.95 (no shipping or tax charged) and we will be going back to Target today to see what actually happens. Keep you posted...