If you have the Blue Streak Toilet Chemical system and need to purchase the Blue Streak Chemical, you may want to check out RVupgrades.com. I found the Blue Streak Chemical priced at 3 bottles for $23.15 + shipping of course. That calculates to $7.72 per bottle before shipping. I have not found the chemical below $10 anywhere, even at RV Surplus, Elkhart, IN.