Is there a list of promos being release this year? I know of Spin Master offering a Marvel United promo but not much info as if you need to purchase a core set or if it's just available.
Gen Con just sent out a code for a free Syrinscape sound set.
Prepare yourself for the Gen Con experience with Syrinscape!
Immerse yourself in the audio experience of Gen Con with our official SoundSet! The Gen Con SoundSet transports you to the crowds and stalls of the legendary Gen Con Exhibit Hall, regales you with cosplayers and character stories, unleashes a massive monster attack on the convention, and even includes the mighty roar of the official Gen Con Dragon. As a special bonus, it’s yours free! All you have to do is create an account and then head to our Voucher/Gift Cards page and enter the code GenConRulz.