If you're interested in the belt, it's possible that Bruno negotiated a deal with the makers that would see part of his compensation being that he recieve a certain number to sell on his own. I doubt that's the case here, but if it is, he may sell them a bit cheaper, AND you could get a personalized autograph & probably a picture.
I'm considering that Highspots has such a small inventory of them. That either indicates exclusivity or low expectations insofar as sales.