Texas Butane has filled our propane tank regularly for years. We have never run out, much less gotten low. They are very good about checking tanks before cold weather hits which I really appreciate.
We are billed and do not pay ahead. The driver simply leaves an invoice in a special envelope on the door. We also get a statement from the company. Natural gas prices are way high, but Texas Butane isn't taking advantage of it as far as I can see.