No guarantees, but I spotted a couple of sealed UMD movie titles today at the 99 Cent Store (Fullerton, CA). They had Jarhead, Jackass, and National Lampoon's Tooned Up. Could be worth looking into if you're looking for cheap UMD's - they don't appear to hold much value for flipping or reselling, but if there's multiple titles out there, it's a dirt-cheap way to grab some relatively decent movies.