Here is a cute car bed that's less than $20 and free shipping on orders of $50 until the 14th.
http://www.collectionsetc.com/Item76177.aspx
They also have some really cute tents for less than $20 that would work for those that like to use tents for the potty pads.
http://www.collectionsetc.com/SearchResults.aspx
You could get the tee pee tent and rename it the pee pee tent LOL! Sorry, I couldn't resist.