For those who don't mind refurbished, here is a link to the headphones under the Amazon Renewed program. Like the earlier HD600 & HD650 refurbs I posted from Amazon, it appears that these headphones that fall under the Amazon Renewed banner come with a 90-day warranty. Granted some of the prices listed here aren't that great. Sometimes even insulting, when you can get brand new for the same or less. YMMV. At the moment there are 13 pages of headphones. I imagine this list will be updated regularly, so it might be worth bookmarking for future reference.
FYI, one of the ways to confirm if the refurbished headphone is covered by a 90-day warranty, you should see a description that reads the following:
Product works and looks like new. Backed by the 90-day Amazon Renewed Guarantee.
Renewed products work and look like new. These pre-owned products have been inspected and tested by Amazon-qualified suppliers. Box and accessories may be generic. All Renewed products come with the 90-day Amazon Renewed Guarantee.
Here are a few models that might interest some of you. These are deeply discounted but limited stock.
Final Audio Design F7200 IEM (1 left in stock) -- $212.18 --
https://www.amazon.com/Final-Audio-Design-Resolution-Headphone/dp/B07T4WM3C6/
Final Audio Design FI-BA-SS IEM (Flagship model) (1 left in stock) -- $386.07 --
https://www.amazon.com/Final-Audio-Design-Earphones-Stainless/dp/B07SD6168H/
Sony MDR1AM2 Over Ear (1 left in stock) -- $109.99 --
https://www.amazon.com/Sony-MDR1AM2-Resolution-Headphones-Refurbished/dp/B07F1WS11P/
Beyerdynamic T5P 2nd generation (6 left in stock) -- $679 --
https://www.amazon.com/beyerdynamic-719005-Audiophile-Portable-Headphones/dp/B071DXNBC6/
Amazon Renewed Headphones link:
https://www.amazon.com/s?i=electronics&srs=17871147011&bbn=493964&rh=n:172282,n:493964,n:172541&lo=list&dc&fst=asff&qid=1562664585&rnid=493964&ref=sr_pg_1