With orders of $25 or more, Amazon offers Prime members the 3M Scotch-Mount 1/2" x 5-foot Molding Tape, model no. 03609, for $2.71 with free shipping. (Non-members can spend $35 or more to qualify for free shipping.) That's the lowest price we could find by $3, although in June we saw it for the same price via Subscribe & Save. It can be cut to size and is engineered to attach vehicle body side moldings, trim, and emblems.

Note that this item is offered through Amazon's "add-on program" and can only be purchased with an order of $25 or more. Allow up to two months for delivery.