Power Master 15% was $15.00 last week at Hobby People while on sale. It's going for about $20.00 all over town when not on sale. The 20% was $20.00 during the sale, the 5% and 10% don't seem to ever come up on sale for some reason. I'm switching back over to gas again and only keeping three or four glow planes flying. That way I will only need about 10 gallons of glow a year.