That’s a bit of a risky business. In the end you have to rely on the reseller. I did find one or two offers on Amazon for refurbs of the latest generation AP Extreme (6th gen, 802.11ac, 1.3 Gbps). Note these are not Apple refurbs, they’re Amazon’s resellers’. But that said, Amazon is very good about their return policy. So at ~$110 I’d probably take my chances (make sure to check all the alternate offers too). If everything works well you have a great router to use for many years. And if you don’t like what you got or it’s flakey, just return it within 90 days for a full refund.