Amazon has this deal available until 1 September and while stocks last so get your order in. The deal is available for both silver and black colours, the latter is normally more expensive.
This is the lowest price Amazon has had for the headphones and John Lewis has them for the same price, too.
The price reduction might be partly due to Sony announcing the new WH-1000XM4, but that doesn't stop this being a bargain. The 2020 model looks pretty much identical and while it does come with a few upgrades, the XM3 remain an excellent pair of headphones in their own right.
In our review, we said: "noise cancellation is still absolutely unmatched, and it’s backed up by audio that’s almost as good."
Buying the previous generation of a tech product is often the best way to get a great deal and often represents better value-for-money than the replacement.