With orders of $25 or more, Amazon offers the Nintendo Switch Super Mario Brothers Premium Travel Case for $9.99 $8.97 with free shipping. (Target charges pennies more the same, while Walmart charges a couple of cents more — both via in-store pickup.) That's the best price we could find by $3. It fits a Switch and 14 game cards.

Note: This item is offered as part of Amazon's "add-on program" and can only be purchased with an order of $25 or more.

Update: Walmart now matches the above price.