The one I use happens to be Pet Supplies Plus. Some things are cheaper elsewhere (rawhide strips at my local grocery store, or pig ears from my local feed mill). Nonetheless, it’still the best place to go for kitty litter, cat food, and dog food, when they have a sale going.
This time, I forgot to bring my printed out $5 off $30+ coupon, and thought I was screwed. Not so.
If you ask, you might not get, but if you don’t ask, you won’t get. I asked, and got the extra $5 off, even though I forgot to bring the coupon with me. I love this pet store.