(Minneapolis, MN)  --  For the first time in months, the Metrodome is the place to be with Vikings single-game tickets going on sale this morning at the downtown Minneapolis stadium.  The team's new ticket office on the west side of the Metrodome opens for business at 9 a-m.  Ticket are available for all ten of the Vikings' preseason and regular season games, although seats for games against Dallas and Green Bay are part of package deals.  Anyone who wants tickets for the October 17th game against the Cowboys must also purchase seats for the September 26th clash with Detroit.  Tickets for the Packer game can only be bought along with seats for the September 2nd preseason game against Denver.  Vikings players are due in Mankato tomorrow for training camp, with the first practice scheduled for Friday afternoon.