I bought mine off Amazon
Here's an example. Mine was under $20 but I got a knitting book too!
http://www.target.com/gp/detail.html/601-0661186-4598500?ASIN=B0000VYJYW&AFID=Froogle&LNM=B0000VYJY W|PetMate_Burrow_Bed&ci_src=14110944&ci_sku=B0000V YJYW&ref=tgt_adv_XSG10001