LIMITED TIME Domain.com Coupon for September 2012 OFFER. This coupon and offer expires September 11, 2012 at 11:59 p.m. Pacific. 20%off domain.com coupon is good for 20% off new products and services. No minimum purchase required. All renewals on products and services after the initial discounted period will be charged at the then current standard list price for the selected period. Coupon is not valid with certain TLDs, renewals, transfers, custom website design, other coupons, or special pricing.