I bought my Apple TV on LeBonCoin for info 
You can find models in very good condition for less! (I see models at €150 on LeBonCoin)
Google Thread Border Routers:
Displays : Nest Hub (2nd generation), Nest Hub Max
Wi-Fi routers : Nest Wifi Pro (Wi-Fi 6E)
Streaming devices : Google TV Streamer (4K)
I see Nest Hub 2nd gen at €50 on leboncoin
Amazon Thread Border Routers:
On Amazon’s side, it seems you need an Amazon Echo 4th generation.
After that, you only need a Thread Border Router for Thread devices; it isn’t necessary for Matter devices that are already on the Wi-Fi network (example: Matterbridge, Wi-Fi devices)