The promotion runs until July 31st, so you’ve got a few weeks to take advantage of the deal. However, the controllers are only available to those with a paid Nintendo Switch Online membership — and the free trial doesn’t count. You’ll need to log in with your Switch credentials to buy them through Nintendo’s online store, and Nintendo is limiting sales to four sets of two NES controllers.
First released back in 2018, the controllers replicate the design of the original Nintendo Entertainment System’s bundled gamepads but add the convenience of wireless connectivity and a rechargeable battery. Like the Joy-Con controllers, they can only be charged by attaching them directly to the Switch, making the portable console a requisite accessory.