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Amazon.com has Duck Brand 1304959 Color Duct Tape, Single Roll, Blue for $3.50.
Shipping is free with Prime or on $35+ orders.

https://www.amazon.com/Duck-Brand…B002TOL400

Walmart [walmart.com] has 20-Yard x 1.88″ Duck Color Duct Tape (Blue) for $3.50. Shipping is free with Walmart+ (30-day trial for $1 [walmart.com]) or on orders of $35+.