CO2 is cheap, but not when Sodastream sells it. People that want cheap carbonated water have modified their sodastreams to accept larger beverage-store CO2 bott

CO2 is cheap, but not when Sodastream sells it. People that want cheap carbonated water have modified their sodastreams to accept larger beverage-store CO2 bottles: http://www.frugalwoods.com/2014/08/11/how-to-cheap-homemade-seltzer-with-a-modified-sodastream/ http://www.frugalwoods.com/2014/08/11/how-to-cheap-homemade-... Higher fixed costs, but if you drink a lot of carbonated water, you quickly recoup it.