Since used markets vary a lot from area to area and day to day, you are better off doing a search yourself. Whatever we may find could be sold by the time you check it. For $80 is it very unlikely you will find anything to match a 1050. Heck, a decent power supply for a gaming computer can hit $80 on it's own.
Look at your local craigslist for systems. You probably will need to go up to $150 for a usable computer with an earlier i5 CPU or something similar that will run a 1050.