Cheap website for pet medicine?

I am trying to reorder flea medicine and heart worm preventative for my dog. I usually buy it from the vet but my mom told me that nearby are some websites that are cheaper and send it to your house. I know one is 1800PetMeds. Do you know of any others? Can they be trusted?
Answers: There is a great website call I am doing my first order from them. It be really simple and i thought they had better prices than anyone else online.
pets r us

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