Step 1. Create an EVGA account.
Step 2. Complete the 1min test @ https://www.evga.com/power-meter/
Step 3. You get your 10% coupon off any one PSU
Note: I think the coupon is applied static so if you add the most expensive psu $299.99 and apply the coupon, you get $30 off then I changed to the $119 psu instead and the $30 discount is still applied. I was able to complete the purchase. YMMV