Using AmEx Membership Rewards points to buy Bose QC35

Hey there,
I am flying to London this month and I would like a pair of QC35s for the flight.
I have approx 50k American Express Membership Rewards points and want to work out how I can get the closest to getting a pair of QC35s.
The gift card selection is quite limited, only like Coles Myer, no JB Hifi or anything.

Any suggestions?