So I take my dogs to a "regular" vet for their checkups but take them to Vetco for vaccines which is much cheaper. They are also able to do the yearly heartworm test which you'll need for the Rx heartworm meds. Vetco is a mobile vaccine clinic and they make stops at local Petco stores. They allow for online scheduling now (they didn't used to and it was a mess). You can also ask your vet for written Rxs for any meds and get them filled elsewhere/ online- usually the vets charge more for the same meds.