My house is wired for Ethernet and I have two 2.5GB switches. One where the Bell drop and router are located, the other in my own home lab. The others haven't been upgraded past gigabit, including the LAN-connected mesh access points to provide the wifi.
It all depends on how long you're willing to wait.
If you can wait two weeks, Aliexpress will do fine and has done me fine for both my switches and my interfaces (
cheap PCI cards for the desktops,
USB dongles for laptops and PCs without empty slots). If you limit searches to the ALi "Choice" collection shipping is quite fast ... as little as 10 days ... if the order exceeds $10.
Of course returns are handled very differently, but for cheap commodity stuff the better vendors on Ali will just re-ship without demanding the return.