Apple MacBook Air 13.3" Certified Refurbished Intel Core i5 8GB Memory 256GB Flash Storage (2015) Silver MMGG2LL/A - Best Buy
I just bought a second hand macbook air 2015 11 inches (i5 4gb ram) and I'm shocked how well it runs for basic office writing and scientific data analysis use. : r/mac
MacBook Air 11" 1.6GHz (Early 2015) | mac of all trades
Apple 13" MacBook Air Early 2015, Intel i5 5th Gen, 256GB SSD 8GB RAM - A1466 | eBay
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Apple MacBook Air 13.3" (Early 2015) Core i5 1.6Ghz, 4GB RAM, 256GB SSD A1466 #5 | eBay