Okay, Society6 is having all kinds of different promotions as a Christmas-shopping-time gimmick; I don't fully understand what's going on, but you can still get the free shipping and five dollars off if you go to the shop through this link.
It lasts through December 14th.
Okay, I think I get it now. Throughout this week, they have certain things discounted on certain days, but you don't need special links for those. ^_^