Dixie's Patch List: A large list of letterboxing patches with links.
Mark and Sue's Patch List: Another large list of letterboxing patches with links.
The Traveling Repository of Letterboxing Patches: Complete catalog of all known patches out there by Der Mad Stamper.
Patches For Sale: Now Der Mad Stamper is also selling lots of patches to support the Travelling Repository. Lots of old and new patches for sale.
