I talked to a guy on the phone today... He said right now they always have 5 and 10 lbers in stock in Freddy, but when I told him i was interested in a 20 lber it sounded like there were plenty of options to have 20 lb tanks on hand in town too... so im guessing it would just be a matter of heading up and exchanging. If I do end up getting a 20 lber, and I cant see why I wouldnt with the price for refill, Im just going to try to make sure they have a full tank on hand... You never know when you will run out.