I found a Judas Priest Nostradamus box set signed by 5 on https://www.theautographsource.com/.  It is the store located in Aspen, CO.

I didn't include a picture of the item because it is the only Judas Priest item there on sale and it has a copy right.  I contacted them for a copy of the PSA cert and Rick sent me a jpg and the cert # so I can verify the authenticity on PSA.  It checked out.  What does it mean if the Primary Subject says Ian Hill?

While I was doing some research myself, I came across the same Nostradamus box set with same description on Amazon and eBay with price difference on sale by theautographsouce store front.  On Amazon, it was $100 more than the actual store listing and on eBay it was $10 more.  It sort of sent up red flags for me because I don't know what's going on.  Now, I am questioning are the autographs authentic.  Why the price difference?  All three places indicated they are Aspen, CO.  I like to get some opinions on whether I should still consider the item.