You can now buy it for $33 at Amazon US&EU. You get 5% off with the promotion code “SonyRumors”.
This NP-FW50 battery has a USB Type-C charging port that reduces charging time by 30% compared to other USB-C camera batteries, and reduces charging time by 40% compared to conventional charging. With high current charging (5V/1A), you can have a full battery in 135mins. And it comes with a charging indicator to clearly show the charging progress. Red indicator for charging, green indicator for fully charged.
One more thing: Also their new NP-F550 and NP-F970 batteries are now on Amazon.