There is a super deal on this Leapfrog Games for the Explorer or Leappad at Toys R Us. They are on sale buy one get one free. In the end you get two for $18.74 or $9.37 each. This is probably as cheap as you will find them. I remember last year the cheapest we found them was $14.99. You can shop online and get free shipping on your order of $49 or more or with a Shoprunner account. This offer is also available in store.
Go through Shopathome to get 2% cashback or 1% via Ebates.