Plugable 2.5G USB C and USB to Ethernet Adapter, 2-in-1 Adapter:
https://www.amazon.com/Plugable-Ethernet-Adapter-Compatible-Thunderbolt/dp/B084L4JL9K/
https://www.microcenter.com/product/637641/j5create-jce145-usb-c-to-25g-ethernet-adapter

SSDs:
https://www.microcenter.com/search/search_results.aspx?N=&cat=&Ntt=850+EVO+2.5%22&searchButton=search

2.5 gigabit pcie card:
https://www.amazon.com/Cudy-2-5Gbps-Express-2-5GBase-T-PE25/dp/B08L8PK1SF/

QNAP switch:
https://www.amazon.com/QNAP-QSW-1105-5T-Unmanaged-Broadcom-QSW-1105-5T-AMZ-US/dp/B097CPP3J5