***Twin fraternal girls born at 35w6d in 12/2008***
I did a lot of research on this last year. I found a few sets that I liked at PlayNation, and then basically searched until I could find the cheapest price.
PlayNation had some of their sets on Craigs List. They were new, in the box, and hundreds of dollars cheaper. Ebay is a good outlet too, especially if the place is local.