It was already a week past Black Friday, but UW-Madison junior Lauren Gunderson, 20, still managed to strike a great bargain when she walked up to an Overture Center ticket window Friday morning with $20, and walked away with a pair of prime seats for that evening?s performance of the Madison Symphony Orchestra?s “Christmas Spectacular” worth $151. The Madison Symphony Orchestra has ratcheted up its marketing among students like Gunderson with its student rush tickets, offering the best seats available at the time of sale. Students must present an ID to buy up to two $10 tickets the day of the show.While student rush has been around for awhile, sales this year have on average more than tripled from the 2009-10 season, said MSO marketing director Ann Miller.