I have my AP's setup and all I need now is sine sort of firewall appliance. I am hopping to make it run openwrt as that's what I'm used to using. I'm looking at a nanopi but they seem expensive and overpowered to me. Is there a cheap alternative?

I am working on setting up internet at a new place and I have the ability to design it from almost the ground up. It needs to be cost effective.

I already have a device that will act as a router but now I need wifi

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