Secondipity via Amazon has the extremely well reviewed Sony MDR-1000X for $260 (certified refurbished) with free shipping.
Secondipity is a well known refurb channel for Sony. Headphones are $398 new. This is the lowest refurb price that I have seen.
https://www.amazon.com/gp/product/B01N4BEKO1
These are the best noise cancelling headphones available currently based on multiple review sources.
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