Yes I use petmeds & petRx.com sometimes petmeds wont have tilly's med(dopamine) which my vet charges 96.00, between petmeds 65.00 & 58.00 at petRx. 4 years I have been alternating between the both of them and I have noticed petmeds are increasing in prices. because of its popularity! petRx is far more reasonable and always have tillys type of meds available as well as advantage & frontline. Try petRx.com and compare prices