80 bucks for an optiplex honestly still is not bad, as long as it comes with an i5 or better (gen 7 and up ideally) and has at least some ram and storage included. The Lenovo’s I like to run are the M75q. That’s the best price-to-performance imo. But most any model will work for just running a node or a few lightweight virtual machines. That goes for dell, lenovo, or even HP