There is time. Check the tickets forum on this site. Walk up tickets may be hard to come by for hockey, not a problem for football. There are also season ticket holders that can't make it that sell on ticketmaster, so check there as well.
Edit: After looking at the ticketmaster map, there are quite a few single seats available for walk up purchase for hockey. If you need more than one together, there are quite a few together in the top rows of 311, also available for walkup up purchase. If you have a preference for lower bowl, you'll have to pay the price for those seats from season ticket holders.