I have sold several cards and other items for $5-100....like mikeinreco said, $10-100 for a hard drive (depends on what you have, SATA or SSD). People buy parts from copiers, printers...any number of things (even the plastic covers and trays).

Basically, the resale market (if you know what you are doing and know how to test) can make you some decent money....again...all depends on what you get, consumer desktops or modern telephone systems ($$$$$) to even medical things like monitors (I sold an UNTESTED one as a parts monitor (I did not have the power supply and was not buying one to test it as it was proprietary), for about $100). Point is, learn what you are doing, know what you have, test the right stuff....make $$$$$. Sometimes even ALOT of $$$.