How much is a fair price to sell the water4gas version kits?

[ELECTR0N3RD]

Hey all, I need some help, you see I need to make some extra cash quick to be able to pay my insurance bill before it gets canceled how much is a fair price to sell those little glass jar ones, or even the abs one that i have built for about 150 dollars, the little one usually costs me around 40 bucks to build, anyone have any suggestions?

[mneste8718]

Well maybe you should consider how much gas this is going to save on average and estimate how fast it is going to pay itself off with the savings in gas and then make a price for it....