Buying directly from the Mets, a 100 or 300 level ticket alone costs more than that. At $60 this is a total steal, at $30, well, you start to think like me...wondering what the catch is."
Kurt goes onto say that there really is no catch, but there is a limited number and it is for select dates. Who knows if this will be an option for years to come, but here is the McFadden website for more information on dates and prices. My recommendation would be to plan ahead and take advantage of this phenomenal deal.