Apple’s online store currently has a wide selection of refurbished MacBook Air models priced as low as $749 — starting with the 11.6-inch MBA with a 1.7GHz Intel dual-core i5 processor, 4GB of RAM and 64GB of flash storage, which is $749 after a $250 discount. At the other end of the pricing scale is the 11.6-inch MacBook Air with a 2.0GHz Intel dual-core i7 processor, 8GB of RAM and 256GB of flash storage, now $1,199….