Are you looking for something like cultured stone?
"Cultured Stone" is a generic name for faux stone cast from concrete. It's lightweight so it can be surface mounted directly to a wall...no ledger required.
Some brands are better than others, so get an up close look before you buy.
It runs about $4.50 a square foot for field pieces and about $5.50 a linear foot for corner pieces. Prices for Connecticut.
Check out this article for more info:
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