Yeah it's a Z-Store 'Featured' Item. The below seems complicated but it's not.
Z-Store/Featured/Double-click FF slot (FREE (duh, huh, but the option to buy one at half price is here too))/And then scroll down the next list that pops up and it has both FF slots (the half price one and the Free one) again - find the Free one and claim it/Log out/log in/have new FF slot
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There's ~ 17 hours and 15 minutes left.
Played the game for like a year before I got my first Freeform slot and already was a big fan. Then I got my first FF, and, it's a whole other world. I'm just really happy for anyone like this that gets this feeling dropped on them this extended weekend and for those of us that save up forever for these things and then *cha-ching* one is sitting there waiting to be claimed as a prezzie.