Amazon offers Prime members the Outward Hound Hide-a-Squirrel Ginormous Plush Puzzle Toy for Dogs, model no. 31004, for $14.31 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.65.) That's the lowest total price we could find by $2. It features six squeaky squirrels hidden inside a 15"-tall plush tree trunk.
Of note, also available is the Large Plush Puzzle Toy for Dogs for $7.99 with free shipping for Prime members. That's also the best deal we could find by $2. It features three squeaky squirrels hidden inside a 8.1"-tall plush tree trunk.