Sources on this?

No this is Patrick.

Where are you finding then for $25-$35? Ebay has them going for $70+

Check your firewall logs (Status -> System Logs -> Firewall for pfSense, can’t remember for opnsense). I’d suspect you might see blocks from 10.0.66.x to your Playstation.

Yeah it sounds like you’re still going to need something that can support VLAN routing not just hard coded VLANs or isolated guest networks. If one of your other devices happens to be a desktop that you can run a small VM on you could potentially run pFsense as a VM then buy a 2 or 4 port gigabit pcie card as a stop gap until you find a better solution. You could even do the same with a laptop and say a USB ethernet adapter or two. Neither of those options would be better than having a dedicated device acting as the router though.

You might also be able to something with say a cheap managed TP link switch but that would really depend I think on what the rest of the network is doing.

So you probably won’t be able to without a router that is capable of supporting VLANs (not just vlan tagging). If you aren’t looking to spend any extra money and have an old computer lying around you could look at getting a multi port network card and running pFsense/OPNSense as an inexpensive alternative.

Do either routers support going into what’s called an AP access mode instead of router? If they do then you could put one into access point mode and run a patch cable between the two.

You may also be able to load DD-wrt on them but checking https://dd-wrt.com/support/router-database/ it doesn’t look like either have support.