were can i buy....

a seperrate hard drive for my ps3? im buying another 80 gig ( yes we will have 2 in the house ) and ill need more space then 80 gigs,so where could i get like a different hard drive,just a hard drive not a different ps3,like even a 250 gig one will work . thanks,oh and what size will fit my ps3? its the big ps3 thanks

Any electronics store or electronics website... check newegg.com

could i get one at gamestop?

No, in fact they might laugh.

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=40000380&IsNodeId=1&Description=2.5-inch%20SATA&name=Laptop%20Hard%20Drives

Any of those hard drives would work up to 500 GB and up to 7200 RPM Now here's a guide :D Hope this works out!

http://www.gamespot.com/features/6176090/index.html