How much does betta food cost?
new life spectrum petta pellets 7-8 bucks Frozen blood worm flat, 4-6 bucks
If the cost of food worries you, you don't have enough for a proper aquarium.
About 5 for a small can. It should last for years if it’s only to feed 1 betta.
If you can't spend $3 for fish food that'll last a year you shouldn't get the fish.