Tiki Resort's newest charm can't be bought from the store or sent via the gifts page. It can only be picked up for free from the game's official Facebook fanpage. The Shoe Charm is an unreleased item and being offered exclusively to fans who click here.
Using the Shoe Charm grants you 100 XP and one of three decorative shoe collectibles. After dropping the charm into the volcano to activate it, one pair of Red-Sole Pumps were left on my resort island. If I choose to, those Pumps could be sold to gain me 4,000 Coins.