Amazon.com has 21oz Feline Greenies Natural Dental Care Cat Treats (Salmon) for $8.55 when you checkout via Subscribe & Save. Shipping is free with Prime or on orders $25+.
Petco.com also has 21oz Feline Greenies Natural Dental Care Cat Treats (Salmon) for $8.55 when you select Repeat Delivery. Shipping is free on orders $35+.
Note, you may cancel your subscribe & save subscription or repeat delivery any time after your order ships. New repeat delivery customers save 35% on their first purchase from Petco.