Costco has good sales on the Bose QuietComforts. I recently bought them and am very happy with them. Beware, they are not the Ultra but are pretty good for the price. They are currently listed at $429 but are often available for $199. I have seen them at that price a couple of times since I bought mine.
https://www.costco.ca/bose-qc-sc-hea...000247779.html
Bose did announce a new version of the Ultra, and I saw an article stating they were now the best, but I couldn't find it. Keep that in mind if you are in that price range.
Sony seems to be the king of NC for now, with Bose a good runner-up.
Here is the rtings page based on noise cancelling, FYI:
https://www.rtings.com/headphones/re...ise-cancelling
I also like the Wirecutter reviews. Also, Sony as king:
https://www.nytimes.com/wirecutter/r...ng-headphones/