What is a good ear mite remedy or medicine for cats?

I just got another cat a few months ago. I had him checked out at the vet and he got tested and vaccinated and everything. He had ear mites and the vet gave me some medicine in tiny vials that I poured into the cat’s ears. Since the cat was not happy about having liquid poured into his ears, I was unable to spread it around with q-tips or anything.

I think he still has ear mites because sometimes he’s pawing at his ears and I see the brown stuff inside them.

I know if I call the vet he’s going to say bring the cat in (another office visit cost).

What is a good ear mite remedy, either medicine (from Amazon perhaps?) or home remedy?