The Elder Scrolls Store (thanks Thomas) now offers the promised new dungeon quest for Elder Scrolls IV: Oblivion. In the old days they'd give away the razor to sell the blades, but in this case you'll have to pony up $2.99 for Mehrunes' Razor. Word is: "Conquer one of the deepest and most challenging dungeons in all of Cyrodiil to claim this fearsome weapon."