- Froogle: about $7.99 + shipping per quart
- Checkers: $6.99 + tax per quart
- Walmart Super Center: about $20 + tax per gallon.
Just don't go changing your oil at Walmart - though if you're reading this, you're probably safe.
Funny, Walmart worker I asked about how many quarts are in a gallon thinks there are five. Figures.