HHO Generator Guides And HHO Parts List Knowing where to find the parts is tough. While hho parts can really be found and you local hardware store. Which will also make the prices for these hydrogen parts very depending on the buyers location.While you have many options available starting right now. First take the list of parts I am about to give you andhead over to your local hardware store and purchase them. Then once you have all the parts that are needed to build your own hydrogen booster you can begin to try and construct the hho booster. However I personally recommend picking up a HHO Booster guide before doing so. The guide will run you in the range of $40-100. While you should be able to pick up all the parts for under $100. Saving you at least that much every single month on gas.