Good idea to stock up on Postseason cards?

SDS

Or other series? These are the rarest correct? I bough a bunch of 88 Mazeroskis and hope I made the right move

SDS

I think Maz is a pretty safe investment, last year it was PS cards that went up the most, but we don't know how it'll be structured this year. The market is just waiting holding it's breathe to see what this collection is/does.