Apple launches new Retina 4K 21.5-inch iMac, all 27-inch iMacs now feature Retina 5K displays - 9to5Mac
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Apple 21.5" Certified Refurbished iMac with Retina 4K Display Intel Core i3 3.6GHz 8GB Memory 1TB HDD (2019) Silver MRT32LL/A - Best Buy
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Apple iMac Retina 4K 21.5in All-in-One Computer Intel i5-5675R QuadCore 3.1GHz 8GB 1TB - 2015 - MK452LL/A (Renewed)
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Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
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