Cheapest tix to Preseason Packers

In town, not huge NFL fan, looking to go to game as cheaply as possible--don't know how long wife n son will want to stay. What's face value of preseason tix? Can get nosebleeds for $44 online--through Ticketmaster (official Broncos, right?) Any chance of ftf scalping even cheaper (or better seats) day of game? I know scalping above face value in Denver is illegal, but I'm looking for deals. Thanks