Well you can install Start9 OS on any old laptop that you have too, and it's cheaper !
I plan to use this:
https://ixustrade.nl/aopen-de7000-dc-t4500-at-2-30ghz-4gb-250gb-w-o-dvd-with-ac-91-ade01-7010.html
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I would bump the RAM too. I'm finding 4GB limiting, plan to upgrade ASAP.
I had a 6 year old laptop sitting at home with 1To HDD, I upgraded the RAM to 12Go (added 8Go to the initial config), and it’s working perfectly !
If you are doing Start9 here is the list of known good DIY hardware. If I was you I would get an SSD and at least 8gb ram.
https://community.start9.com/t/known-good-hardware-master-list-hardware-capable-of-running-startos/66