A shelf dispenser in a supermarket provides pieces of paper that offer $1.00 off any thermasilk hair care product. customers can redeem their savings at the time of purchase. this sales promotion is a _____

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Based on the description,  this sales promotion is a Coupon.
Coupon is a type of marketing tools that provide consumers with free products or financial discount if  reedemed to the sellers.
This type of marketing tool is used in order to persuade customers to buy a certain type of products/services that company prioritized..