New Super Mario Bros U Deluxe / Super Mario Party $20/£16 each (digital only) with free circle coupon (US details required) @ Target (USA)

You're going to need an American e-shop account on your switch to make this work. Your also going to need an American address and phone number.

Fake US addresses: fakexy.com/
Fake US phone numbers: fakenumber.org/

1.) Create your American eshop account and add to a separate profile on your switch (look online for this)
2.) Sign up for a target account at target.com/ and join their "circle club" (I can't remember the exact name) when you do
3.) Go here target.com/cir…796 and click "Save offer"
4.) Put one of the games (if you add both you only get the discount once. You need to do 2 transactions, possibly on 2 accounts (haven't tried myself), to get the discount on both) in your basket and checkout. Don't use PayPal to check out unless you have an American PayPal account. I used a UK registered Amex, but I know at least one person got this working with a Visa debit.
5.) Add the download code to the American account on your switch.
6.) Enjoy

Pro tip: If you pick an address in a state like New Hampshire, or Alaska, you don't pay any sales tax.

Edit/Bonus: You'll have 300 gold points for each game, so that should be enough to pick up an indie game. If you're changing regions on your main account, rather than using a separate USA account, you will need to do this before switching back.