i got my chamber brush from sportsmans warehouse, only other ar specific cleaning product i know of are chamber stars and i have no idea if anyone carries them locally.

i use break free clp, otis universal kit, one piece rifle length cleaning rod with chamber brush (i keep the rod in my range case to knock out stuck cases when shooting dirty ammo), an old tooth brush and q-tips for the chamber. all of which are very easy to find locally and can clean most any firearm.