Any second-hand business class laptop, i.e. HP Elitebook/Probook/Zbook, Dell Inspiron/Latitude/XPS, or Lenovo Thinkpad.
Businesses tend to get rid of them after 4 years, even if they're still in good condition. Great bang for your buck and easily repairable if something does end up breaking.
It generally is. Just make sure to know what model you want, and to make sure that the bios isn't locked (computrace basically bricks them if enabled).