eat2na
100+ Head-Fier
Sorry I don't know if this has been posted already or how good of a deal it is. But I noticed that it is way cheaper than all the other reputable vendors.
http://accessories.us.dell.com/sna/products/Headphones/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=A3485280
http://accessories.us.dell.com/sna/products/Headphones/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=A3485280