I just got their newsletter with the following info:

Since it's almost Spring, we're looking forward to warmer weather at our headquarters with coupon code SPRINGLIGHT which will let you buy brand new com/org/net/info/biz domains at a discount.

When you buy your domain, we know you'll need web hosting. VPS4U will give you 10% off your first month of any type of VPS hosting. LUVHOSTING will take off 10% of all shared/business/reseller hosting.
I don't know what the savings is for the domain coupon, if you use it please let us know.