I buy water at reef life. The people are nice there. I was in there yesterday. Price isn't too bad. They'll let you use a bucket from them if needed and then give you a store credit back. Just use it on next water run if needed.
Of course I have my own buckets but thats a nice touch.
I would suggest you buy an RODI filter you can get one that will do a reasonable amount per day for pretty cheap. It will cost you a lot less in the long run.
But to answer your question no I don't think there is anywhere else.
If you're in North Jefferson or somewhere driving all the way down 280 is a slog.
If you found someone in Jefferson County with a big RODI you might be able to talk them into some water for a little change idk? Can't speak for anyone.
I am about to upgrade my office RODI in the next few days. I'll have a BRS 75gpd 4 stage for sale soon. Filters was changed in July including membrane and also have a new set of filters for it as well.