https://www.gamespot.com/articles/you-can-now-subscribe-to-nintendo-switchs-paid-onl/1100-6460730/

Nintendo's premium online service for Switch is slated to begin this September. While Nintendo has said it will reveal further details about the service ahead of its launch, those who are already planning on subscribing now have the ability to purchase a membership online.

As pointed out by Wario64, subscriptions for the Nintendo Switch Online service are now available for pre-order from Amazon. The online retailer doesn't list what date the service is scheduled to begin, but the memberships are available in two tiers--12 months or three months--and will be delivered via a download code once the service launches. You can order the 12-month subscription for $20 and the 3-month subscription for $8.