I argee with most others, probably you overpaid a bit if buying for scrap only.
Towers $4 x 18 = $72, servers 3 x $10 = $30, 2 laptops another $5 for a total of $107, this how I would calculate. For the monitors, I count as zero, whether they work or not.

You can still make your money back, but there won't be much profit.