If you're on a budget and you're buying fresh mint, then you're doing it wrong. Mint grows like a weed, in a patch of garden, or on a windowsill. Herbs like rosemary, thyme, mint, coriander, basil you should always be growing.
This is so true. We grow all those herbs in small pots. We also grow chives, beans, peppers, tomatoes and squash in a few medium sized pots and topsy turveys. No traditional garden needed.