This topic is now deleted terrible price though, Lenovo sold them for $200 1.5y ago.

I often look for pfsense, it gives you routers and pcs with at least two ports.
If it can run pfsense, it usually works for openwrt too.

I love this DIY solution, you get 5 ports for ~$265.

eBay prices
Lenovo M720q / M920q / M910x / M920x - $170 and up
i350-T4 - $60 (you can probably find it cheaper elsewhere, and there's also a i350-T2)
01AJ940 riser with bracket - $35

make sure the one you choose actually have room for a PCIe card, not all versions do.

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