Amazon offers Prime members the Twistix 5.5-oz. Original Dental Chew Treats for Large Dogs in Vanilla Mint for $2.79 $2.39 with free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $6.25.) That's a buck under what you'd pay in-store locally for any variety of these dog treats. They include peppermint, parsley, and chlorophyll and purport to freshen your dog's breath.

Note, this item now ships in one to two months.