Ever wanted to see what a $41.5 million dollar collection looks like? Here are the 10 most expensive baseball cards ever. The Ultimate Baseball Collection features 10 of the most expensive cards ever sold in the sport of baseball. These reprints baseball trading cards are from the Major League (MLB) and are made of card stock material. The collection includes vintage reprint cards. This collection is a must-have for any baseball card enthusiast looking to own a piece of baseball history. Here is the ultimate conversation piece. It’s a must have for any game room, sports room, or office. It’s the best of the best.