Microcenter had some refurbished mini Lenovo desktops. We ended up using them for private elementary school to replace some of the ancient Windows XP machines. I believe they are still working 6+ years later. For the price we got them for it was worth it just for the case, power supply, and Windows 7. One of the dads said if he has to change out a motherboard or two he would be able to use the windows license key. Whether he did have to or not I don't know. I just helped load some of the software on the machines.