Did you try this contact number for Sony?
I bought my spare laser assembly today. I have no doubt Sony will keep enough in store to meet their warranty obligations, but having owned an older Sony ES player (that I bought new) that died out of warranty with parts for it hard to find has left me exercising due diligence these days. If I don't need the new part I bought I'm sure I'll be able to sell it to someone who does.
I just bought a backup assembly for my Sony. In case anyone is looking on Sony's site and having a hard time finding info for the part, this is one of the parts sellers Sony recommends.
It took me enough time to find the info that I figured it might help someone else in similar straits. They have them in stock and are selling them for $45+shipping. I'm very much enjoying the Sony, BTW. It was a great deal for a very nice sounding unit.