With order of $25 or more, Amazon offers the AmazonBasics Travel and Storage Case for Nintendo Switch in Neon Yellow for $8.36 $5.39 with free shipping. That's the lowest price we could find by $3. It fits the dock, controller, and six game cartridges.

Note: This is part of the Amazon "add-on" program and can only be purchased with orders of $25 or more.