Some info on the Nook out of warranty trade-in program. Basically, you can trade in an old Nook and be able to buy a new Nook (of any kind) at a discounted price. They don't make this info very easy to find so I thought I would share it here:

Thank you for contacting us about the NOOK trade-in program.

To purchase a NOOK Simple Touch at a discounted price, we ask that you
call us at 1-800-THE-BOOK (1-800-843-2665) and select option 2 for NOOK
Support. We are available Monday through Friday from 8AM to 11PM EST,
Saturdays and Sundays 9AM to 11PM EST. Customers outside of the United
States may contact us at 201-559-3882.

If you prefer to chat with one of our Digital representatives, please
click on this link:

http://www.barnesandnoble.com/nookchat

Please accept our sincere apologies for any inconvenience this may have
caused and we look forward to hearing from you.

Sincerely,

Gizelle
Customer Service Representative - Digital Support
Barnes & Noble
http://www.bn.com/
Visit our NOOK Support site for the latest updates and downloads at:
http://www.barnesandnoble.com/nook/support/