Here's the response I received from Mobella/Southco :
Dear Casey,
Thank you for contacting Southco's eService.
We will be glad to assist you in locating replacement keys.
The Mobella key is recognized by the three digit code stamped
on the keys head. We offer exact duplicates based upon this
code @ $6.00/ea plus freight (UPS ground charge approximately $5)
when ordering direct. The Southco part number is MF-97-911-41. We can
process your request by Visa, Mastercard or Discover payment. If you
would like to call in your credit card number, please contact
Southco at 610-459-4000.
If we can be of further assistance, please address your reply to
info@southco.com.
Southco eService can be contacted 24 hours a day, 7 days a week
Best Regards,
Southco eService
Latches & Access Hardware
info@southco.com
www.southco.com