You can buy now a 1TB WD My Book External HD for $90.00 Several are available.
http://www.ubid.com/auctions/product.aspx?AuctionId=903056735&uwb=ETalert10011B_01292010
http://www.ubid.com/auctions/product.aspx?AuctionId=903056735&uwb=ETalert10011B_01292010