I`ve been looking at foam marker systems for my self made 3 point boom sprayer. Can a person buy the components somewhere, or are we stuck buying a fairly pricey system from one of the many manufacturers.? The foam nozzles and hosing look a lot alike across the brands. The most economicalredi-made system I have found so far is from Salvaroni @ $290 from agri-supply.Thoughts on this idea??