HP ProOne 400 G1 21.5-inch Touch All-in-One PC | HP® Customer Support
HP 20" ProOne 400 G2 All-In-One Desktop Computer P5U53UT#ABA B&H
Open Box: HP ProOne 400 G1 All-in-One Intel Core i5 4590T (2.0 GHz) 4 GB DDR3 500 GB HDD Windows 7 Professional 64-Bit (available through downgrade rights from Windows 8.1 Pro) - Newegg.com