Four new promo cards are now available for the Scarlet & Violet 151 expansion. These promos are only available via the 5-pack Mini Tins box at Costco. They are special cosmos holofoil reverse holo cards of Charmander, Squirtle, Pikachu, and Bulbasaur.
While some Costco stores are limiting the amount that each individual can purchase, some Costco stores are not. Many online Pokémon communities have posted images and videos of Costco stores being bombarded by individuals filling entire shopping carts with these boxes.
They are currently sold out on Costco's website. At this point in time, anyone looking to purchase this box will need to look for it on second hand marketplaces and at Costco's physical warehouse stores.