It would be great if we had a sticky thread where pet owners can pass on current deals they've found. Please post if you have actually made a purchase, this way you can follow up on your experience (good, bad, and indifferent).
What I've found most recently:
Grain Free Food, and free expert advice hotline (1-800-672-4399 24 hours):
Dog and Cat Food, Treats, and Supplies | Free Shipping at Chewy.com
So far the best price I've found for Sheba gluten/grain free foods at about .55 per can, and they sell Blue Buffalo dog and cat gluten/grain free kibble for 20% below most other places, and 25% less than the BB shop on Amazon. Free shipping on orders over $50.
I got my orders delivered very quickly (less than 5 days) Very Happy with them.
Flea and Tick Control, owned and managed by Veterinarians, Free consultations from licensed vets:
Pet Supplies, Pet Health Products Online Store in USA | BudgetPetCare
Frontline Plus 20% less than 800PetMeds + an additional 7% off (as of 9-3-2015), and free shipping
Just ordered yesterday, so I'll post a review of my experience once I take delivery.
Cheers