The Sony service center in Norcross Georgia carries all these things. For some reason, about 3 years ago, they decided to double the cost of the drivers. They were around $25 before, went up to $50! EACH! I'm not sure if all the parts doubled like that, but it sure made no sense to buy 2 replacement drivers for $100+shipping, or a new pair for btw $90-100.
"Dung beetles with ostentatious horns tend to have smaller testicles" source unknown, as read in Harpers Findings, Dec. 2006.