To get future breeders you can either get them from someone you know or a pet store, either way do not get adult or proven breeder get animals that are young, just weaned and raise them until they are ready to breed.
As far a CO2 for small use you can get a paintball canister and have it feel at a paintball place. You can also get a larger tank (5lbs used in the brewery industry) and get it exchanged at places that sell oxygen and co2 like Airgas.
I have a larger tank, they last longer and the tank are verified and filled up by professionals which is not the case in paintball places.
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