[March 11, 2019 note by Steve Cyrkin: Brian Burkel, owner of MMP Collectibles, changed its name to Autograph Collectors Guild in October 2018, and then to its current name, Autographs Authentication Store in February 2019.]
MMP Collectibles of Las Vegas just popped up on a Google search:
Lots of signed music and movie memorabilia.
Take a look.
What do you think?
A few samples from their inventory: