last year when I got my puppy and love it. I use it for several different things and it has come in very handy. It folds up nicely so I can take it along when we travel. I found the same brand (noztonoz) on this website but the pen is a little different now. It use to have a bone shape for the viewing window but now it has a circle. I bought the 24" height and none of mine can jump out of it. My yorkie use to be able to sneak under it at first because he was so tiny (1 lb). Here is the link where I found it but you might be able to find it cheaper on another site. That's what I paid for mine last year though. It's been well worth the money.
http://www.goodsforyou.biz/N2pens.html