Bostik 50 lb. Gray Big Tile & Stone Polymer-Modified Large & Heavy Tile Mortar, $29.99 USD/Box, LL Flooring (Lumber Liquidators)

Bostik Big Tile and Stone is a latex-modified mortar ideal for large tiles, designed to fill uneven surfaces and minimize tile lippage. This versatile mortar is ideal for both indoor and outdoor settings and can be used on a variety of substrates such as plywood and existing ceramic flooring. It exceeds ANSI standards A118.4 and A118.11, ensuring reliable performance for setting large ceramic, porcelain, and stone tiles.