J.
I would go all out and get the nice ones that retail around $200-250. They are so great. My kids have been playing with theirs for more than 3 years now and I know there will be more years of fun. If you don't want to pay retail, look on craigslist.com If you haven't used that site, choose Minneapolis/st paul and then go to the section for "baby/kids". I often see them there for approx $50-100 gently used.