Yes it is true, I took my 500 model into the Sony Style store and $100 was taken off without any paperwork on my part. Also the saleperson must a have been feeling generous that day. I was also purchased the a 3 year warranty and the clip on book light. My total was $229 including tax.
To say the least I was a happy-camper. So to all the people out there bad mouthing Sony I say
to you.
Another experience I had with Sony was with my wife's 500 model. It had poor battery life from the start. Sony replaced her 500 with a 505 and gave her a 2 year warranty for nothing.
Call a Sony store and ask if you can trade in your sony even if it has problems. But be sure to get the name of the salesperson you talked to.