Cheapest I have seen these including the 15% off eBay UK deal via AU sellers that accepted discounted gift cards from over 2 years ago!
They are a closed design and not for everyone. You will either love them or hate them. Great for movies and music, good but not the best for gaming but will still wipe the floor with any of the gaming marketed headsets combos.
If you're unsure on Beyer or dropping nearly $600, I would recommend getting the cheaper Beyer 770 that you can pickup for a ridiculous $170.29 right now! (only the 80 ohm and grey colour at that price) - https://www.amazon.com.au/Beyerdynamic-DT-770-PRO-32-Monitor…
What makes these so great over say a $300 pair of premium branded headphones..? isn't there a point of diminishing returns on these things?