NanoPi R3S is a $30 Router Board with Dual GbE and FriendlyWrt OS Support
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NanoPi R3S
https://www.friendlyelec.com/index.php?route=product/product&path=69&product_id=303
https://www.friendlyelec.com/index.php?route=product/product&path=69&product_id=303