a lot of members on here privately sell them so id totally recommend buying off someone, but it really varies...just look for a good deal. start out with a base, then get more adults as you go along...but i think 15 pairs of adults would be definitely enough. just leave them alone to do their thing for a few months, then when you get a colony, you can sell them to other members! or perhaps other herps you have sides your cham??if any?