The ACP (for Automatic Colt Pistol) is the common designation for most all .380 ammo sold in the USA. You can get it at places like Walmart and Bi-Mart, as well as at your local gun shop or online, in both FMJ and JHP. Winchester White Box ammo, often sold in 100-round boxes at Walmart, works well in the PP/PPK pistols, as does Remington Green Box ammo, usually sold in 50-round boxes. Federal, Blazer, Magtech, etc., also are widely distributed and available. You'll pay less for FMJ rounds ($18-19 per 50 unless you buy in bulk) than you will for the self-defense rounds.