I was looking for a new sony BP-2EX for my D-25 - D-555 and the eagerly waited Denon - DCP 150.
My friend in US asked Sony for a another set and I got this answer:
"I contacted Sony for current pricing and delivery. I have been advised that the battery pack and for that matter, the Discman D-25 is no longer available.
I then contacted an alternate source, who I am aware supplies batteries for many different applications. I was told they are in the process of developing a replacement for this Sony item. It should be available in the next few weeks. I will follow up and advise"