Anyone know of a quarry that sells directly to the public or a dealer in the Los Angeles (or surrounding areas) that wholesales to the public stones/rocks (like fieldstone, basalt, bluestone etc.)?

I want to build a short (18" high), dry stacked retaining wall along the back of my property. We have a couple of local places (e.g. Bourget Bros. Building Materials and West LA Building Materials) but they have limited selections and are VERY pricey.

Thanks in advance!