FloorComfort 4-ft W x 25-ft L x 5 T Premium Foam Moisture Resistant Flooring Underlayment (100-sq ft / (Fan fold) in the Flooring Underlayment department at Lowes.com
Bronze 2mm Foam Underlay 15m2 - Floor Depot
TrafficMaster Standard 200 sq. ft. 48 in. W x 50 ft. L x 2 mm T Foam Underlayment for Laminate and Floating or Glue Down Wood Floors 101202133 - The Home Depot