Your best bets for finding deals this Memorial Day are likely to be Amazon, Best Buy and Walmart. Keep an eye out for deals at other retailers, such as B&H, Target and Costco. I've also seen some good deals at Home Depot and Lowe's. Be vigilant when considering a deal, and research what a product usually sells for to make sure you're actually getting a bargain.
Whether you're just embarking on your smart home journey or want to add some pieces to your current setup, there are many great smart home devices on the market, but not all are "cheap." So if you get a chance to save money on something you've been eyeing during Memorial Day sales, it's probably worth taking it.