Here is a link to one that I just bought. It is supposed to be big enough to hold both of my Yorkies but they sell smaller sizes for one dog. I haven't received it yet, but I can let you know if I like it once it gets here!
https://secure.petco.com/Shop/Product.aspx?SKU=236675
If the link doesn't work, go to petco.com and search for the following item number: 236675