Tomtoc Carrying Case Fit for Nintendo Switch, tomtoc Original Patent Portable Hard Shell Travel Case - $11.19+tax @ Amazon
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Lowest price ever according to CamelCamelCamel. As for the case itself, it is pretty sturdy and going strong for over a year for me, has YKK zippers, and personally, love the slim profile.
Also on sale are their combo sets (hardcover shell + grip backcover) for $15.99 - 5% S&S