RO water, where do you get yours?

[Drfu]

So i have been buying my RO from the Water Store up in the NE as I'm usually up there once a week, their refills are only $2 for 5g, also i know Pisces gets it from them. I have been noticing phosphorus in my tanks so after a few wc and adding phosguard they didn't change. I just tested my ro water from them & found it to be close to 20ppb or .06 ppm of phosphate.

Now i do get it from the vending machine so i plan on going in and asking them whats up? But just in case I'm looking for an inexpensive option, prefer something in the west end where i live.

And before you all say just buy a rodi unit its not in the budget at this time.