Wow, the clearance bins and shelves at my local Sears were completely wiped out of EVERYTHING PS3 related (still a TON of the same old Wii, 360, and DS games left though). I tried looking around to see if they moved PS3 stuff specifically to its own end-cap but to no avail.
Either a new CAG has entered my previously uninhabited turf, or some random guy came in, saw $15-20 stickers, and thought he would try his luck on Ebay (though that wouldn't explain ignoring the other systems with lower prices on better games).
EDIT: I actually was able to find a copy of Tony Hawk's Proving Ground for 47 cents at the bottom of the bin buried under DS games though.