I'd like to know this too.
I'm a bit pissed at Wrapsol at the moment. I tried using their promo code "laborday" for 35% off on Labor Day while their landing lage advertised this promo and it kept telling the promo had expired. I emailed their customer support, and reached out on facebook and twitter. I only got a reply on their facebook page telling me that the 10% off promo code "facebook" should still work, which it does. But c'mon! I would have bought it at 35% off, but their system wouldn't accept it. I feel I was lied to. No reply from their customer support yet.