Paul over at oneforfive.com put together a nice list of available baseball card sets from Strat-O-Matic and when they were originally made available for purchase.

Here is the link current strat baseball inventory.

I know that Strat has thrown out digital printing in the past, but it currently seems to be at a stand still. Therefore, if there is a set that you have been sitting on getting and it has been out for a while, you might want to purchase it sooner rather than later.