One of the best bargains I ever found was the chance to purchase an older, but sound 150 gallon propane tank in 1980. The tank rent then was probably only $20 or so, but in the 25 years I used that tank, I saved far, far more than the $100. I paid for it. No idea what a tank would cost now, if you could find one used, but it still might be something to think about.
One of the greatest advantages to having my own tank was the freedom to change gas delivery companies if the service was poor or the price too out of line with other companies in the area. If you rent the tank, you have to pay quite a bit to change, but if you own it you can change easily, or use it as a bargaining chip to get better service.
Just a thought.
