As already posted, rats, mice an ASF. For a small scale hobby breeder, rats will pay the bills. Your in the Great White North, people are crying for frozen rodent dealers. Even small scale you'll make money an feed your snakes. I clear a few $100 USD when I try to sell ASF or rats at $2 for adults an .50 for pink or hoppers (live or gassed). Rats grow fast ASF are sloooooooow.
Breeding snakes:
Are your clutches large enough to make money?
Are your snakes the "in" thing?
How many years will it take for your snakes to mature?
Hobby breed for what you like. Show the snakes your willing to sell at small local shows an face book groups.
Enjoy your noodles!