From Halopedia, the Halo wiki
The Shop, also known as the Store, is a rotating storefront featured in Halo Infinite, in which cosmetic items can be purchased with Halo Credits. The Store currently has two sections "Daily Offers" and "HCS Offers". The shop can be accessed on the Halo Waypoint.
The game features several Bundles of content, to view them all visit this page here.
Halo Credit Bundles