Tyler Black, the Brewers' #4 overall prospect, and a player we've mentioned before in our efforts to help you make money flipping sports cards, was called up by Milwaukee this week - a milestone that we typically talk about being a solid selling marker for baseball prospects.

The left-hand hitting third baseman is 3-7 from the plate for the Brewers as of this writing, and his card prices are reflecting the call-up hype and solid performance so far in the bigs.