did this with my ps3. bought it and within a week they were offering uncharted 1/2 for free so i went in with the reciept and did a return/rebuy. id already bought/opened the dual pack from amazon so i just traded the two into another gamestop for credit. congrats.
in my experience it depends how much clearance they have. if its just a few they'll be mixed within the regular games. otherwise there'll be an isle or two at the end. they also sometimes have a few clearance games on a front isle with the discount ones.