Complete i7-860 system with 8gb ram and 500gb storage, case, 8800 gpu, w10p and office 2013 for $40:
https://sfbay.craigslist.org/eby/sys/d/concord-old-gaming-computer/6854706599.html
An i5-2400 with 4gb 500gb for $55:
https://sfbay.craigslist.org/sfc/sys/d/san-francisco-lenovo-m91p-i-ghz-4gb-ram/6854687068.html
https://sfbay.craigslist.org/eby/sys/d/concord-old-gaming-computer/6854706599.html
An i5-2400 with 4gb 500gb for $55:
https://sfbay.craigslist.org/sfc/sys/d/san-francisco-lenovo-m91p-i-ghz-4gb-ram/6854687068.html