FLOORLOT BlueStep Underlayment with Moisture Barrier for Laminate and Wood Floors, (200 sq.ft Roll) - Amazon.com
WhisperMat-CS Acoustic Underlayment for Stone & Tile Floors
Moisture Resistant Flooring Underlayment at Lowes.com
Underlay - Flooring
QuietWalk Laminate and Floating Wood Flooring Underlayment with Attached Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 3'Wx66'8"L Roll (Covers 200 sq. ft) QW200B1LT - Amazon.com
The Only Waterproof Underlayment with a Built-In 6 Mil Vapor Barrier
MP Global Products 100 sq. ft. Rolls 30 x in. W x 40 x ft. L x 6 mm T Polyethylene Film Moisture/Vapor Barrier Underlayment for All Floors MB006300100 - The Home Depot