The Godzilla Store has announced new t-shirts, three are to celebrate anniversaries of the Godzilla Store (online), Godzilla Store Tokyo, and the Godzilla Store Osaka, the fourth shirt is for the upcoming Godzilla Fest 2021. All shirts are 100% cotton, come in sizes S to XL (XXL size is available for the Godzilla Fest shirt as well), and retail for 2,750 yen. They can be ordered now from the Godzilla Store, with the anniversary shirts if you wear them in the Godzilla Store you can receive a discount based on the shirt (5, 4, or 1%).
Update: another shirt was added the Marusan Hedorah shirt (below), pricing and other info is the same as the others.