Problem here (and I'm sure elsewhere) is you can't find a propane refill station that has propane so I have to do the tank-exchanges and it's not super economical...
I don't use much, but hasn't been a problem getting the 20lb ones for the grill filled. Last one I took up was probably October. Have 2 places close that fill. WAY cheaper than exchange. Like $12 vs $20+ I think