We have seen several races beginning to use Groupon or other similar coupon sites to attract runners. Runners will buy a Groupon and be issued a unique coupon code.
RunSignUp now has a simple way to import those coupon codes quickly and easily. The video below shows you how to import the codes. Once they are in, runners can register on RunSignUp and enter the coupon on the checkout page to get a discount (typically 100% since they are paying Groupon).