If you already own either Zelda game for the original Switch, then an upgrade pack normally costs $10 each. You don't need to buy these upgrade packs to play your old copy, but they provide benefits like better performance, faster load times, an extra save slot, and access to the Zelda Notes mobile app.
The process is a little less than straightforward, though. Head to the eShop and search for either Breath of the Wild or Tears of the Kingdom. The listings you'll find for the upgrades will show the $10 price tag, but once you add it to your cart, the discount will be applied at checkout. Just make sure you're using the account that's tied to your subscription.
Before you opt for the higher subscription just to get the Zelda upgrades, though, keep in mind that you'll lose access to those upgrade packs if you cancel. At the moment, Nintendo's site says that an "active membership [is] required" to get the Zelda upgrades.
If you're already paying for the full subscription, you might as well get the upgrade for free, but if you're planning to cancel it, you might be better off forking over the $20 for the upgrades directly. At the very least, you can put off paying for the upgrade directly until your subscription lapses.
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