I got flooded with requests to build cheap but powerful Media center PC's for people during the covid outbreak, and after a few months of trial and error, I have found some really good deals. You can pull an i5-4570, 8Gb ram, 240gb SSD, USB 3.0, Bluetooth, Wifi, etc in a mini-atx case for just under $200. You can also get below or above that price by reducing components, so 4gb ram and a standard hard drive can get you to $150. You can lower the price more by going from mini-atx to SFF.
Thee are Amazon Renewed/Refurbished business workstations that were traded in during a lease upgrade. You et a warranty and etc with them also.
I'll toss in a few links, but bet thing is to search Amazon for "Lenovo M92 Tiny" or "Lenovo M93p Tiny" and you can narrow it down by throwing in i5 or i7 into the search. Also another good search is "HP Elitedesk tiny" which will get you results for the HP 800 G1 and G2.. Just sort it by low-to-high pricing and plan on an hour or two. All these models come in ATX, Small Form Factor, or Mini-ATX with he same hardware configurations. I have also seen a few AMD systems. You can also find similar deals on ebay with better pricing, but I always prefer Amazon since they are certified refurbished and have a warranty, optional insurance, next day shipping, and no hassle returns.
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Lenovo ThinkCentre M92p Tiny Desktop - Core i5 Up to 3.6GHz, 8GB RAM, 240GB SSD, Windows 10 Pro (Renewed)
Learn more: https://www.amazon.com/dp/B07KMLHYPY/ref=cm_sw_em_r_mt_dp_KrpGFb1ZYRFQT
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HP EliteDesk 800 G1 Tiny Computer Micro Tower PC, Intel Core i5-4590T, 8GB Ram, 256 GB SSD, WiFi, Windows 10 Pro (Renewed)
Learn more: https://www.amazon.com/dp/B07Q1DL6LV/ref=cm\_sw\_em\_r\_mt\_dp\_BJpGFbXS43BF8