You can go to alot of store that'll more than likely have one. Alot of men's ware store will have an array of coloured button-down shirts. You can try Wal-Mart maybe. Go out to the mall and have a look around, you should more than likely be able to find something similar, and you can always dye one if you can't find the right colour.
Anime North 2011
Cyborg Noodle- Gorillaz- 95%
Monkey- Monkey: Journey to the West- 5%