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The Best Under $100 Pre-Owned Mini Computers to use as Desktop PC's and Servers in 2023 | CheapSkatesGuide
(cheapskatesguide.org)
This is a most excellent place for technology news and articles.
Detailed article.
I’ll just add, I recently bought an Optiplex with a 7500t. It was just over $100, but the Gen 7 Intel means it has quicksync which is great for a media server that needs to transcode.