Revealed January 3, 2020. Up for pre-order on January 5, 2020 at 9am Pacific on the EFX website.

Retails for $699. Limited edition of 250.

It appears to have sold out completely as of January 16, as noted on the EFX website. They have a wait list open, perhaps making more or if some orders don't end up final perhaps.

From the website:

An exciting new addition to our Commemorative 40th Anniversary Helmet Collection with the iconic helmet of the most (in)famous bounty hunter in the Star Wars galaxy: Boba Fett!
$699 (Plus shipping/handling and CA sales tax, if applicable. Does not include duties, taxes or fees for international customers)

PRE-ORDER STARTS TUESDAY, JANUARY 5, 2021 @ 9AM PST! A $300 NON-REFUNDABLE DEPOSIT IS REQUIRED TO PLACE YOUR PRE-ORDER.
SHIPPING IS ANTICIPATED FOR Q2-2021

Limited Edition: Limited to only 250 pieces worldwide
Master pattern cast from our mold cast from the original, screen used helmet from Star Wars: The Empire Strikes BackTM in the Lucasfilm archives
Quality ABS and machined aluminum construction
Full scale 1:1
Functional rangefinder with blinking LED's
Chrome plated
Special ESB 40th Anniversary EFX display stand
Numbered metal plaque
Certificate of Authenticity

THIS PROP REPLICA IS A COLLECTIBLE FOR DISPLAY ONLY. THIS IS NOT A TOY AND IS INTENDED FOR ADULTS ONLY. NOT FOR CHILDREN UNDER 14 YEARS OF AGE.
BY ADDING THIS ITEM TO YOUR CART AND COMPLETING THE CHECK OUT PROCESS (CLICKING ON THE "COMPLETE ORDER" BUTTON), YOU HAVE READ, UNDERSTOOD AND AGREE TO OUR TERMS OF SERVICE.
© & TM Lucasfilm Ltd.

Product specifications subject to change without notice.