The only way is by offering price deductions as well as discounts depending on the quantity of products purchased. (babykaed.com)
But ONLY ONLY for books from my faves that I won't wait for price deductions. (hughhowey.com)
Insurance companies provide different price incentives, such as discounts for anti-theft devices, for memberships in motorcycle groups or clubs, and other price deductions (trustedchoice.com)