yeah, most of the bagged stuff is like, 1"-3" or so (guessing).
sounds like you are looking at cobble sized pieces, which aren't as common.
See if you can find a rock yard/stone supply/landscape supply company in the area that sells bulk rocks (usually by the pound, ton, or cubic yard).
They might have some?
I see plenty of the large gravel/pebble size (what is typically bought in the bags), sometimes you can get the finer stuff (1/4" or so) that's used to cover the soil for potted plants and such, and I sometimes see the boulder sized pieces that are used as landscape accents.