My wife purchases bags of frozen "pinkies" for her small snakes (garter/boa). When they get larger, she purchases live pinkies at the pet shop. Some of the garters are nearly ready for "fuzzies". The ball python and corn snake can handle live adult mice.
We can probably raise our own mice for the small number of snakes. The two cats and 7 dogs eat significantly more, so we've been buying ahead in anticipation of supply problems. We had been able to buy 3 x 40 lb bags of dog food from Costco until 2 weeks ago. Costco has a 1 bag limit now.
How many snakes do you have?
I used to get defective chicks at the poultry farms for my boas. Free food.