A huge sale started today and looks like it goes until November 1st
Congrats! Breath of the Wild will keep you busy for
a while. Some accessories to look into would be a Hori Split Pad Pro, for when you're not playing on a tv. And an 8Bitdo USB adapter so you can play using your Xbox controller. It's been a life (controller) saver for me while playing Tears of the Kingdom. Controllers for the Switch are expensive and not very durable.
For physical games you're going to want to make a wishlist and set up deal alerts through Deku Deals. Also check Wario64 and CAG on Twitter regularly. Switch games will sell out fast.
For 3rd party digital games, also use Deku Deals. It's great for checking a game's price history to help make your best judgement on whether or not the current price is worth it. You're in luck because a lot of games (over 2,000) just went on sale today. Keep in mind many cross-platform games run poorly on Switch. There's a lot of junk to shovel through, but some real gems to be had depending on what genres you like to play.
You can find new games on sale every day, but the main sale day is Thursday, around noon. $1.99 is the lowest Nintendo will allow publishers to list their digital games, but some of them will offer additional discounts for owning one of their other titles. Quibic, Baltoro, Drageus, Forever Entertainment, Daedalic, and Cool Small Games do this quite often so be aware before you pay full price for any of theirs.
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Another thing to look into is a Switch Online Plan. You can share their family plans with up to eight people, which means you can split the cost of NSO + Expansion and make it just $10 per person for the whole year! Then you will be able to play all the classic N64, Nes, Gameboy, etc games that they've released so far. Totally worth it if you can get a group together. Many CAGs here are in groupshares like this.