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Newegg offers HP Business All-in-One PC ProOne 600 G1 with 21.5" 1080P IPS Display, Core i5-4590S 3.0GHz Quad Core Haswell Processor, 8GB DDR3 1600MHz Ram, 500GB SATA III 7200 RPM HDD, Gigabit Lan, DVD-RW, Wireless Keyboard & Mouse Combo, Windows 10 Pro 64 Bit with Win7 pro Downgrade rights, Gigabit Ethernet, 180W Power Supply @ $ 494 with coupon code EMCEMHE56.
This also comes with free NETGEAR A6200-100NAS AC1200 867Mbps WiFi Dual band AC Adapter, priced at $ 23.

Also this model comes with 3 years warranty from HP.