HP Prodesk 400 G1 SFF Slim Business Desktop Computer, Intel i5, DVD/RW, USB 3.0. | eBay
HP ProDesk 400 G1 Mini PC SFF i7-4785T 2.20GHz 4Gb 500Gb K6Q44UT [Prodesk 400 G1] - $449.00 : Professional Multi Monitor Workstations, Graphics Card Experts
Amazon.com: Li-Sun 240W Power Supply Replacement for HP ProDesk 400 600 800 G1 G2 SFF(P/N: 702307-001,702307-002, 751884-001, 751886-001, 796351-001, 702457-001), Also Works for HP Desktop with 200W Power Supply : Electronics
Refurbished: HP ProDesk 400 G1 SFF i5-4570 3.20GHz 8GB 1TB Win 10 Pro 1 Yr Wty - Newegg.com