For anyone interested, the U.S. Postal Service facility in Lake Mary has listed 7 Arc Welders at auction on the GovDeals website, all of them starting at $35. I believe they all end on July 30th.
Most are various Miller models, (Gold Star 300, Syncrowave, Shopmaster, Thunderbolt), plus a couple of Daytons and a Thermal Arc.
Each of them says "not working". - Believe me, they might be dusty, but they don't get a lot of use, and though I did not go to that particular facility, I went to several others in the Southeast over the last 2 months, and more than 90% of the "Non-Operational" equipment I checked out worked perfectly fine. Just sayin'-
Here is a link to the Welder category:
https://www.govdeals.com/en/welding
Scroll down on that page, and on the left under Seller, click the USPS checkbox.