Was buying some stationary at my local WHSmith store (Winchester) when I saw a cardboard box of games and stuff in plastic CD sleeves. Games seem to be priced at a bizarre price of £11.90 each. I had a quick rummage and got House of The Dead 2 & 3 for that price, noticed a few PS3 titles there too and Spiderman on the Wii. The disk was in perfect condition and the manual was fine, the same as when they are stored in a drawer with the dummy box on a shelf. I'd guess that the packaging has gone walkabout and a stocktake highlighted that the items were to be wasted or sold off cheap.
Probably store-specific, but if you are wandering through it might be worth checking on their CD/DVD counter to see if your local store has a few bits to offload.