Monogram Direct will be selling a San Diego Comic Con exclusive Kingdom Hearts Pewter Pin Set at their booth, (#3645), during the convention next month. Included in the pin set are Sora, the Kingdom Hearts II logo, King Mickey Mouse in his black coat, the Lionheart Keyblade, the Heartless emblem, and the Way to the Dawn Keyblade.
Each set is listed at $30.00 USD, but only 500 sets will be produced and will only be sold during San Diego Comic Con.
Thanks to @Churro on Twitter for the tip!
UPDATE: Monogram Direct will also be selling this pin set at New York Comic Con 2017 with limited availability, along with their other San Diego Comic Con exclusive Kingdom Hearts merchandise. Check out more about that in the full article here.
UPDATE [Dec. 14, 2017]: Monogram is now selling this pin set on their online store, along with their other San Diego Comic Con exclusive Kingdom Hearts merchandise. You can check out more about that, and find out how to purchase these items, in the full article here.