Amazon offers Prime members the Petstages Tower of Tracks Cat Toy, model no. 317, for $9.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.44.) That's the lowest total price we could find by $13. This stacked play station features three levels and a hollow compartment for treats.
Note: Expect shipping to take between two to five weeks.