This is the girls new hayrack that I made from 2 sections of a pet playpen I got a couple of weeks ago. There is a piece of coroplast attached to the bottom with zip ties so their feet won't get stuck. They really like this one.
Yes, I got them at Walmart. I also used two of them to make the ramp going to the third level of the cage. Walmart had them on clearance so I got several of them.