Amazon.com: Dell OptiPlex 390 MT Core i3-2120 3.30GHz 4GB 250GB DVD+/-RW Windows 7 PRO 64-Bit : Electronics
H61M Motherboard Set With i3 2120 CPU Socket LGA 1155 DDR3 Memory 16GB M ATX H61Desktop Mainbord Support Intel Core i3 i5 i7 CPU|Motherboards| - AliExpress
Refurbished: Dell OptiPlex 790 Small Form Factor with Core i3-2120 3.3GHz Dual Core Processor, 8GB Memory, 500GB Hard Drive, and Windows 7 Professional - Newegg.com