OK I have the straight goods.
There never was a Sony drive - just the Sony Laser.
We buy the drive from Stream Unlimited and they originally used the Sony Laser but now use the Sanyo laser due to availability.
The good thing is that Stream Unlimited manufactures the drive and a lot of manufacturer's use it so it looks like it will continue to be manufacture for many years to come.
As always there are no guarantees with technologies that are no longer supported by mainstream manufactures.
james