Raspberry Pi 4
The latest iteration of this cheap and tiny computer now has support for two 4K displays via micro-HDMI, Bluetooth 5.0, and a faster CPU than ever. It also packs gigabit Ethernet, 2 USB 2 ports and 2 USB 3 ports, and up to 4GB of RAM. Initial demand is high, so it might take a while to get one, though.
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