.... have a fill your own station. you bring you jug in, fill it up, pay at the cash register (like 3-4$) then waaalaaa.. RO water...
i myself have a RO system, i gotta pretty good deal on it (28$ - it helps when you have connections) but most retail for 350-400$
i'd advise you check out sears, home depot or similar, they ususally have them, and they are usually at that price range...
skitz