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Canopus Group [amazon.com] via Amazon has their Non-Slip Carpet and Rug Tape for $ 7.69. Shipping is free with Amazon Prime or orders $ 25+
[list][*] Keeps carpets, stair treads, rugs, mats or tile on any surface, firmly in place; Provides excellent adhesion to both smooth and rough, textured surfaces[*]Easy installation and durable; Grips every surface securely for a strong, long-lasting hold; Easy to peel and install by hand; Tear to length, stick down and remove the easy-peel backing to secure rugs and carpets in place
[list][*] Keeps carpets, stair treads, rugs, mats or tile on any surface, firmly in place; Provides excellent adhesion to both smooth and rough, textured surfaces[*]Easy installation and durable; Grips every surface securely for a strong, long-lasting hold; Easy to peel and install by hand; Tear to length, stick down and remove the easy-peel backing to secure rugs and carpets in place