Exo doesn't do discounts very often and they are in completely different class than Kuiu for packs. Look for a used exo in the classifieds, much better pack than Kuiu.
EXO does a discount for first responders and military. Other than that, not really anything unless they have some blems but those normally sell out in about 5min in the spring.
I thought EXO used to do a Elk101 discount (10%) but not sure anymore. I would call and ask them.
I have owned both a Kuiu pack and 2 EXOs and they are not even in the same class. EXO makes a great pack, stands behind their packs and has great CS.