I found this edition of Mint Condition interesting. Robert Edward Auctions has an item up for bid it claims is possibly the bat Roger Maris used in 1961 to tie Babe Ruth's then-record of 60 home runs. But the Hall of Fame in Cooperstown claims it has the bat Maris used to hit home runs 59, 60 and 61. Which is the real bat? There's probably no way to ever authenticate, but the one in the video comes from an Orioles clubhouse attendant and is signed and dated by Maris with the day he hit his 60th home run. What I'm confused by: Maris hit No. 60 in New York (he did hit No. 59 in Baltimore a few days prior), so how did the visiting clubhouse attendant from Baltimore get this bat?
Here's the full story of the bat's history. That post says studies of photographs from 1961 show that Maris likely used different bats for Nos. 60 and 61, so it's possible the Hall of Fame does have the record-setting bat but not the record-tying one.
Anyway, the bidding is up to $15,000, so you'll need at least $16,000 if you want to own it.