I've gotten by there once and I liked his shop. It's a little hard to find. (If you haven't been there before, it looks like it's a workshop at 55mph.) Although he didn't have prices posted on a lot of the tanks, he did have plenty of copies of price sheets and his prices were reasonable and competitive with those online. If I'm coming back from the Tidewater area and have a little time to spare before the spousal unit realizes something's up, I'm sure I'll be back.
It is a violation of federal law to use this product in a manner inconsistent with its labelling.