I just ordered the Best Pet playpen (medium) for Ozzy from Amazon for $35. I'll let you know how it works. I read a lot of feedback for the couple brands that are out there and this one seemed best because the bottom of the other one I looked at just went on with a few 1" velcro strips and many people complained that their dogs escaped all the time. I'm really excited to try this out, because I think Ozzy could use a little more room to move around. The drawback I've heard on the one I purchased is that the zippers can break quickly.
Amazon.com: Best Pet Folding Play Pen - Blue -...