Here is Sony's response to the broken stylus for my prs350:
hank you for contacting Sony Parts.
The information you requested is below:
A1786740A
STYLUS ASSY (Silver)
Unit Price (in USD):$62.91
You can order any available items through our website, or call us at (800)
488-7669.
http://servicesales.sel.sony.com
TIP: Shipping charges and local taxes will be added at checkout.
NOTE: Parts do not include installation instructions.
Thank you for choosing Sony.
The Sony Parts and Accessory Team
C79T
Richard
Yes, that is $62.91 for the little plastic, poorly designed, stylus replacement. I found this unbelievable, but I did confirm the price on the parts page.