For a limited time, you can buy the SanDisk 128GB MicroSDXC Memory Card for Nintendo Switch + Switch Online Family Membership (12 months) for only $34.99 (50% off) with FREE Super Saver shipping (or with Amazon Prime).
--Nintendo-licensed Memory card for the Nintendo Switch system
--Instantly add up to 128GB of additional space
--Transfer rates up to 100MB/s(1) tp load games fast
--NES and Super NES - Nintendo Switch Online – Enjoy a curated library of 70+ classic Super NES and NES games. You can compete (or cooperate) online with friends, share your screen, or virtually pass the controller, depending on the game
--Save Data Cloud – In addition to the game data regularly saved to your system, you’ll have online backup. This makes it easy to retrieve your game data if you lose your system or start using a new one
--Smartphone app – Enhance your online experience with the Nintendo Switch Online app. You can use voice chat with players in compatible games, and access special game-enhancing features for select titles
Be sure to check out all the Amazon deals that I've been posting for some great deals
Please note: Amazon prices tend to change quickly, so be sure to check the price before you buy.