We buy anywhere from 6,000-20,000 tons of WASHED stone per month from Vulcan and are paying top dollar. They just went up $5 per ton on Jan 1. $450 sounds right for ABC stone. I work for a local Ready Mix producer and we sell what we call wash out. Its basicly leftover, processed concrete that has alot of the same characteristics as ABC stone. It is not as clean but it makes a great base for driveways and parking areas. Im not sure what the exact cost is but I think its about 1/3 the cost of ABC delivered. I can check our current pricing if you would like. The only drawback is that you will have to spread it. We cant spread on the go due to the consistincy of the material.