Rock Star Guitar Displays
The reason why some guitars that are hand signed are less expensive than others is that when signings are done, the “pic guard”, (the piece under the strings that looks removable) is signed and the guitar is not necessarily the actual one that was used by the musician. Those will be less expensive, although they do carry an authentic autograph.
hollywoodmemorabilia.com carries both guitars that were actually used by the musician and ones that have only the pic guard signed. They are all autographed and come in a beautiful guitar display.