Walmart.com has Soldam: Drop, Connect, Erase for Nintendo Switch for $ 9.99. Shipping is free for orders over $ 35, or you can choose free store pickup (which comes with a discount perk). Make sure that you are buying ship and sold by Walmart.com, as Walmart.com has some 3rd party vendors selling it for the same price of $ 9.99.
If you choose the free store pickup, it will drop an additional $ 0.25, making the game $ 9.74.
Remember, you will have to pay any and all tax that may apply.