Amazon.com: CoverTec GlazeGuard Matte Ceramic And Porcelain Tile And Grout Sealer, Flat Finish (2 Part A+B=36oz Kit) : Home & Kitchen
Marshalltown 12-fl oz White Ceramic/Porcelain Tile Grout Sealer in the Indoor Floor Sealers department at Lowes.com
MAPEI Grout Refresh 8-fl oz Pure White #5117 Ceramic/Porcelain Tile Grout Sealer in the Indoor Floor Sealers department at Lowes.com
Custom Building Products Aqua Mix Sealer's Choice Gold 0.8 qt. Penetrating Sealer for Tile, Concrete, Porcelain, Stone and Grout AMSC24Z - The Home Depot