Probably best checking with your local lumber yard. There are several drainage products that are similar and much cheaper. We sell a product called "Home Slicker" in 3 ft. wide by 50 ft long rolls for about $90 per roll. It's made to be installed on top of the sheathing and housewrap, but under the siding. It creates an air space behind the siding and allows water that penetrates the siding room to flow down and exit the wall cavity. It's a yellow plastic woven product much like the hypervent (wich I would guess is a similar product repackaged for marine use.) It may not be available in stock in most yards, but most could order in a roll or two.
