There is no discount on install bid jobs because our margin is as low as we will go to (hopefully) make a modest profit. We discount our club members on repairs and perform free annual inspections on their plumbing and heating systems. Other coupons are used to aquire new clients and retain existing. Our service pricing is different due to productivity and coupons are built in as part of the marketing budget. People like coupons and we also have a friends and family discount.