Experts-I'm looking at getting a short retaining wall--about 2-3 feet high, 50 feet long. It's going along a private alley so we can't see it (the alley is lower). Of course the look of stone is nicer, but if the savings are there I could go for cement block with parging I think. Any sense of what the savings are? Is this going to save 50% or more like 10% (or somewhere in between)? I know there are tons of variables, but what I'm really wondering is whether there's much savings to be had on labor and materials if I go with cement block.