Scotch Heavy-Duty Exterior Mounting Tape – Link

Amazon has this currently marked down to $3.

Note that this is an Add-on Item which ships with a $25 Amazon order.

• One roll of double-sided tape for mounting items up to five pounds
• Ideal for mounting address plaques, signs, and more
• Weather-resistant tape that holds securely to indoor or outdoor surfaces such as stucco and brick
• Roll is 60 inches long by one inch wide
• Made in the U.S.A