Memorial Day is this Monday. Stores like Walmart, Target, Best Buy, Kroger, Publix, and many others are open.
However, Costco is CLOSED.
National Parks should mostly be open, but one may need to check with individual sites.
Walmart, Target, Macy’s, JC Penney, Best Buy, Home Depot, and more are expected to have some kind of deal or sale. They should be open with normal hours, but like any holiday, check ahead of time.