I have a couple cool jabo type things;
Starting with these signed collector sets, one set is signed by David McCullough (The Master himself) and the other is signed by Joanne Argabrite as one of the founders of Jabo, Inc.
They are numbered, so I am sure some other ones are out there, I have 4 sets total. They may all be signed but I am not sure, all 4 I have are signed and dated by either David or Joanne. There could be other signers too so not sure on how rare these are really.