With orders of $25 or more, Amazon offers Prime members the Kyjen Outward Hound Hide-A-Squirrel Large Puzzle Toy for Dogs, model no. 31011, for $6.12 with free shipping. (Non-members can spend $35 to qualify for free shipping.) That's a buck under our October mention and the lowest total price we could find now by $5. It features three squeaker squirrels hidden inside a plush tree trunk.
Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.