(Image credit: Shutterstock) With less than two weeks until Memorial Day, retailers across the board are rolling out early holiday sales to prepare for all those outdoor celebrations and backyard barbecues — and Amazon is no exception! The retailer is currently slashing prices on everything from patio furniture and grills to running shoes and smart home devices. If you're looking to spruce up your outdoor spaces, Amazon has a plethora of outdoor essentials starting at $11 . Hoping to grab a new pair of sneakers for running season? Brands like Asics, New Balance, Skechers and more have you covered.…