Amazon.com: Vapor Barrier Seam Tape, Moisture Barrier Seam and Seal Adhesive for Crawl Space Encapsulations, Carpet Padding, Underlayment or Marine Use, Waterproof 9 Mil (4 Inches x 180 Feet, White, 12 Pack) :
ROBERTS Seam Guard 1-7/8 in. x 100 ft. x 0.005 in. Underlayment Tape Roll 50-040 - The Home Depot
FloorComfort Underlayment tape Silver in the Flooring Tape department at Lowes.com
Stikatak Polythene Clear Joining Tape (W)48mm | DIY at B&Q
Blue Hawk Seaming Tape in the Flooring Accessories department at Lowes.com