I know a lot of vets in my area use Wedgewood, they are in NJ. I found a local compounding pharmacy for the meds I needed. It pays to shop around, prices do vary!
really depends on where you live, i think. i had good luck with Diamondback Drugs in Arizona and Golden Gate Pharmacy in northern california. they were pretty reasonably priced, and added flavoring to make the meds more palatable.