I always hear about codes you can use to buy tickets before they go on sale to the general public.  My question is, how do you go about getting these codes, etc?  Sara just announced a headline show in Portland, Oregon on July 19th.  Tickets don't go on sales until May 6th.  Any suggestions on where to look or who to contact about pre-sales.  I am going to the Sugarland concert the night before (7/18) where Sara is the opening act.  I am sitting in the balcony because the Sugarland fans bought tickets through pre-sale and virtually nothing was left.  Any help?