eForCity Premium Heavy Duty Durable Protection Silicone Skin Case for Microsoft Zune 30GB mp3 player, Solid JET Black with Access to ALL Buttons
Great case for the price.  My only complaint is that it has way too much give in the back so that when using the armband that I bought, it moves around a LOT.  Otherwise, it's going to be a great everyday protection for the Zune.