Spend $100+ at NatGeo’s Store, Get $20 for a future purchase

The National Geographic Store has a special promotion, you can see it at the top of their website: if you spend $100 or more in a single transaction between 11/3 and 11/26 in 2014, you will automatically receive later on a $20 promotional code for a future purchase. To use the $20 promotional code, your next purchase must be $20.01 or more. Shipping, taxes and such do not count towards the limits. The promotional amount must be used by 12/31/14. Click on the link on the top of their page over there for the detailed terms and conditions.