

If you go with eBay, still look local for someone who is selling surplus stuff. There’s a lot of hassle and cost for the seller over ebay, but they are not allowed to arrange anything via a back channel - however, once you have bought one thing and you are happy with them, you have their contact info! You can ask for more or reach out in the future directly when they look to have lots of stock of something you like. They will probably be happy to avoid eBay and get some easy sales.

If you got a $20 10g Ethernet, chances are you didn’t get one that is well supported on Freebsd. They currently lag behind Linux on the drivers for those. If you had a fully supported card, network throughput often beats Linux (with the caviat that it is going to depend on what you are doing with the firewall and QOS, obviously).