Just ordered a 6 pack of this stuff from Amazon. They're running a $6 "coupon" along with a Pennzoil $10 "mail in" (via internet, took me 3 minutes) rebate, which also apparently includes an extra $5 coupon for future use. Total price delivered here in MD is $32.57, or $5.43/quart, not including the $5 coupon. I also threw in a PureOne filter for $5.76.
With the parts chains all going to "oil change specials" with synthetic for $30-35, usually 5 quarts and a filter, this pricing from Amazon is pretty competitive and doesn't require me to go to the store, make repeat trips because they don't have the filters in stock, etc.
jeff