Bought a refurbished Gold Air 2 from the Apple Store today. Would have preferred Space Grey but someone bought the last one before I could make a move. It was still a very expensive purchase (only 128GB available) so I'm cringing at the £65 additional price tag they want to charge me for an official Apple Smart Case. Is there a cheaper alternative that can do just as good a job or is the Apple case worth the expense? Cheers!