KEH sent me this coupon code LUCKY10A for an additional 10% cash back if you sell your gear to them between 12pm EST on 3/17 and 6pm EST on 3/18 by using this link. This is how it works:
KEH provides an online quote on your equipment here (people are earning an average of $700 on their submitted gear)
You pack and ship the camera gear off to KEH for evaluation
KEH evaluates equipment and sends cash payment to you