As of 2015, Remington Thunderbolt .22 caliber long rifle rounds are sold in packs of 5000 at Sportsman's Guide, Gunbroker.com and Lucky Gunner. This type of ammunition is a 40-grain lead round-nose bullet with rimfire-primed brass cases.
Remington designed the Thunderbolt for young or novice shooters, practice plinking, small animal hunting or match shooting. The gun makes a relatively quiet sound compared to other rifles and has less recoil, so beginners may find the trigger control easier to learn. Ammunition is relatively cheap and the rounds come in boxes of 100, 500, 1000 or more. There may be additional costs for shipping and handling.