I'm using a chinese generic labeled as kingdel for mine. It's the same machine Avado sells at twice the price.

The best part is that it is fanless. It can take 1 sata, 1 msata and 1 nvme/sata drives and 2 sodimm modules.

https://smile.amazon.com/gp/product/B087JMGL1M/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1