Register and then post it for sale on the thehighroad.org in the Accessories for sale section.
Make sure to include your state in the title of the thread.
Specify if you're willing to ship it or if it's available face to face only (FTF).
How to ship it by UPS Ground is outlined in this thread:
If you don't have a UPS full customer service center near you then arrange to have UPS pick up the package because many of the local UPS stores won't accept packages with an "ORM-D, cartridges - small arms" label on it.