FWIW, I own a 20# that I have had for almost 8 years, Ive had 2 hydro-tests done, Both tests were $12 plus fill, Its been since Feb since last fill, But it use to run $15 for a fill, You do the math 
Im curious about the trade in refill, Around here you have to be on a 10 year lease of a tank = $100.00 what are you paying if anything?
Im curious about the trade in refill, Around here you have to be on a 10 year lease of a tank = $100.00 what are you paying if anything?