This offer has been around for a while now but for any of you that are an Amazon Prime subscriber and you own a Nintendo switch you can get up to 12 months of Nintendo Switch Online benefits, including online play, access to classic NES™ games, and other benefits with Twitch Prime.
You just need to link your Amazon Prime account to your Twitch account. Next, link your twitch prime account to your Nintendo Account. For more details see the link below.