It’s known as “scalping” for a reason: Usually when you buy a ticket from a reseller you can expect to pay a hefty markup....

It’s known as “scalping” for a reason: Usually when you buy a ticket from a reseller you can expect to pay a hefty markup. But in a bright spot created by the down economy, those markups are turning into giant discounts for many prime sporting events — if you know the right way to shop.