As one of its daily deals, Best Buy offers the Insignia 13" Hard Shell Case for Apple MacBook Air
in Grey, model no. NS-MMA13SG, for $9.99
with free shipping
. That's the best deal we've seen for a case of this size and lowest total price we could find today by $54. It features a card holder, polycarbonate material, nonslip exterior, dust-resistance, and play-through design. Deal ends today.
Don't mind an open-box unit? Best Buy via eBay
has it for $2 less.