Check out Drano Ultra Max Gel at Costco. Costco cuts $3 off on this item now. It comes in 2-pack with 80oz each bottle. The price at Costco is absolutely the lowest.
Price: $7.49 after $3 instant savings, valid Dec.29, 2015- Jan., 24, 2016.
Cost at Costco: 4.6 ¢ / fl oz.
Compare to $19.99 + $11.99 for Shipping (as of Jan 14, 2016 @ 22:01 GMT, Details. We get commissions for purchases made through links in this post.), 12.5 ¢ / fl oz. at Amazon.com
Compare to $12.97 + FREE in store pickup, 8.1 ¢ / fl oz at Walmart.
Costco Item# 686230
Drano claims that this Ultra Max Gel is the thickest most powerful gel for removing tough clogs and works great to remove hair, soap scum, and other gunky clogs. We haven’t used this product before, it received 4.3 out of 5 stars based on the 156 reviews (as of Jan 14, 2016 @ 22:01 GMT, Details. We get commissions for purchases made through links in this post.) from Amazon, majority reviewers feel it’s a great product and does good job for clog pipe.