The Mandalorian cereal consists of sweetened corn puffs and pale green marshmallow pieces shaped like The Child (or better known around the Internet as "Baby Yoda" although he's not actually Yoda).
Come late July, you'll be able to find the new Star Wars cereal at all Sam's Club locations in a box with two bags of cereal for $5.98. In mid-August, it'll be available at Walmart in single-bag boxes.
Photo via Sam's Club.