32oz Liquid-Plumr Pro-Strength Clog Destroyer Gel w/ PipeGuard $3.35 at Amazon
Amazon has the 32oz Liquid-Plumr Pro-Strength Clog Destroyer Gel w/ PipeGuard for $4.57 - $1.22 off coupon (click "Save an extra" box) =
$3.35 with free shipping on $25+ or with Prime
(extra 5% off for 5+ S&S orders).
Original Source of Info