22, 38, 9mm, and 45ACP are the cheapest priced rounds you can get in the firepower ranges they offer.
You can get into reloading your own for around $450, that is a decent press, dies, powder, brass, bullets, primers, etc., for one caliber.
The CO2 pistol is a great idea, especially if you can get one to match one of your existing pistols.
For budget austerity, a few bricks of 22LR is a good choice. The thing to do is to make it a monthly budget item, and make the purchases as opportunity arises. Winter is a good time to stock up.
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