I would advise looking into the Kel Tec. You can get the .380 acp P3AT which is one of the thinnest, lightest and smallest on the market at a very reasonable price. They also make the 9mm PF9 and slightly larger higher capacity P11.
I have fired the P3AT and like it better than my NAA 380 which cost nearly twice as much. My P11 has over 500 rounds through it without a malfunction