Coupons are great
I am a big fan of coupons. You have to remember, most customers have a big fear of change, a fear of switching from an old vendor to a new vendor. Coupon help this type of clients try something new. There is a feeling of less losss if thing don't work out and it is helpful to the client and the business who offers the coupon. Remember, the coupon has to be big, you must give a lot out to attract the new client. Once they have tried you and see your price is good, your service is good, then it will be hard to switch you for a new vendor, because now you are in their comfort zone.