In case you haven't noticed, new Oblivion content is available on Marketplace. Here's the description according to Major Nelson:
"The lost Ayleid City Varsa Baalim has been unearthed by a rogue Telvanni arch-mage, in pursuit of a fearsome Daedric Artifact, Mehrunes Razor, which he believes will give him the power he needs to topple the Imperial reign - but what horrors lie in wait beneath the Valus mountains; and can you overcome them to claim Mehrune's Razor as your own?"
You can grab Mehrune's Razor for 250 points. Personally, I'm waiting for the next expansion: Kerrek's Aftershave.