Amazon.com: North States Superyard Classic XT...
we got this one and love it, we have two little boys. They actually will go to it at night and scratch at the sides when they are ready to go to bed. In the day sometimes when I am working in the front room where its located they will scratch at it to be in it. Some people told me it was going to be too big to potty train them in (that they would have accidents everywhere) but I didn't find that to be the case. They use the puppy pad in there just fine.