RE: 218bee, 219zipper or 22hornet??? Help!
The .22 hornet would be the best choice, I've never seen ammo for the zipper, and rarely for the .218 in the 5 stores I buy at. The hornet is more common, and thererore less expensive. Any of these three are farely small for coyotes, and if I'm not mistaken are illegal to hunt them with, at least the .218 and .219. Just for price, I'd go hornet.
Fast fact for you, eskimos used to hunt polar bears with the hornet, because the ammo was so common and cheap. Talk about a rush, hunting something that can kill you so easily with a rimfire!!!!