Ayre has discontinued their Blu-ray player. McIntosh currently has the MVP901, but it doesn't play Blu-ray 4K discs, it only upsamples to 4K. It's expected they will follow with a true 4K model.
I think the only USA built players you'll find will be from high-end manufacturers, so be prepared to pay large. The current McIntosh MVP901 is $5,500 MSRP.
Steve