It's possible to go one step further and to just grow the mint yourself, mint is probably one of the easiest plants to grow.

But please just grow it in a pot and with some distance to other soil in the bottom because otherwise you will have mint everywhere and it will be very hard to remove, it will become a bad weed.

I have planted it two years ago and sometimes if I feel like it I water it and so far it's gotten pretty big from just some small plants.