Final answer:
The common type of sales promotion for consumers where they receive an additional product or offer upon purchasing another product is the Buy One Get One (BOGO) offer.
Step-by-step explanation:
The common type of sales promotion for consumers where they receive an additional product or offer upon purchasing another product is the Buy One Get One (BOGO) offer. This promotion allows customers to get a free or discounted item when they purchase the same item at full price. For example, a store may offer a BOGO deal on shoes, where customers can buy one pair of shoes and get a second pair for free.