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" FHD All-in-One Computer, Intel Core i5-4570R, 8GB RAM, 1TB HD, Mac OS, Silver, ME086LL/A (Refurbished) - Walmart.com
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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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Apple iMac 21.5" Desktop with 4K Retina Display, 3.0GHz, MNDY2LL/A - (June, 2017) for sale online | eBay
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