but have you tried simply creating this look yourself? It does require A LOT 1/4" masking tape, but it's very Do It Yourselfable. Basically, you grid the walls with the masking tape in a stone block pattern, then put colorant into some drywall mud (something "stoney" like limestone-tan, or granite gray, etc.), and then apply a VERY THIN coat over the walls. Immediately pull off the masking tape "grout joints". It leaves a 3-dimentional looking stone.
When this is fully dry, you can apply more stone textures and shading with sponge painting techniques.
Remember, it's only an illustion, and when the furniture gets into the room, it will not be the only thing you see, so it doesn't have to be perfect. Have fun!