As announced last month, the Shop Atlus online storefront has been launched worldwide as of today, on November 17, 2021. The site has been opened in a beta state, with site adjustments still being made.
The launch video for the shop can be seen through the official Atlus West tweet.
Many other Persona related products are available for purchase, including T-shirts, sweatshirts, pillows, mugs, and wall art.
Merchandise overview images via Cheap Ass Gamer:
Persona 5 Royal Merchandise
Persona 25th Anniversary Merchandise
More products will be coming soon, including Persona 25th Anniversary themed fitted masks and a fanny pack. Right now, the two product brands available are Persona 25th Anniversary and Persona 5 Royal, with Persona 4 Golden, Shin Megami Tensei III, Catherine: Full Body, and Shin Megami Tensei V being added in the future.