I Give My Dog Phenobarbital For Seizures As Prescribed By

I give my dog Phenobarbital for seizures as prescribed by his vet. I give him 1/2 a tablet two times daily. The prescription is 90 tabs and 97.2 MG each tab. my question is regarding assistance to find a cheaper way to get this or Jack. When I picked up his prescription is was $97. That was in July, and the price had just gone up. Are you able to give me any advice to help Jack and not have to pay so much? Thanks.