My friend grabbed a Daytona shirt with Samardzija on the back when he was down there last year. He's worn it to happy hour at bars around Wrigley for about the past 2 months.
I've bought tickets a couple of times from legit sellers before game days. Legit meaning the guys who have officers/right off the el. Again, wait til gametime for prices to come down, and make sure you have the right game before leaving.