Update: Price has slightly increased to $6.70.
Advance Auto Parts.com has 20oz. Chevron Techron Concentrate Fuel System Cleaner on sale for $6.50. Select free in-store pickup to save on shipping, otherwise free shipping on orders $75 or more. Thanks MINImike.
Alternatively, Amazon.com also has 20oz. Chevron Techron Concentrate Fuel System Cleaner on sale for $6.50. Free shipping with Prime (free student accounts available) or if you spend $35 or more. Use slick fillers to find other eligible items to help reach the $35 requirement.
Note, item is temporarily out of stock but may still be purchased and will ship when available.
Deal Editor's Notes & Price Research: Previously a very popular front-page deal back and available again. Also, received a 4.6 out of 5 customer reviews via Amazon - Discombobulated