eBay is also a very safe bet. There are over 500 auctions out there & many will go for less than face value.
I saw something about the ticket exchange in the dome.
You can order them direct from the Vikings, probably the safest.
Here is the google for "ticket exchange vikings":
Vikings Playoff Tickets
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Vikings Ticket Exchange
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Vikings : TicketExchange
Buy tickets directly from Season Ticket Owners - Visit the Vikings TicketExchange. If you don't find the seats you want here, be sure to check Ticketmaster ...
www.vikings.com/TicketsPage_TicketExchange.aspx - 29k - Cached - Similar pages