If you're just looking for a shirt that says "Bo Knows ... Whatever," have one made custom. It's fairly cheap. Again, search Google for custom t-shirt makers.
"Bo Knows..." shirts can be found online. There are a wide variety of colors and designs to choose from. You can also have these shirts personalized to fit your taste. I've found some on zazzle.com and ebay.
I searched online for some for HOURS! And you can onlybuy it online... You might want to go on: Jabbawockeez.com and buy it online...but that's your only way to really get the shirt you want...and don't worry they have TONSS of different styles to choose from :)
You can buy the latest arsenal away shirt from most sport shops, or online shops such as Ebay, or Amazon.com
You could buy it online.
You can by one in Gainesville or you could search online
Try e-Bay, that has EVERYTHING!
If you cannot get it off line in Perth, Australia, you can buy it online from Amazon.
australia.shopandshipworldwide.com
You can buy it online at www.somalab.net and the company will ship the product to Australia. Australia is Somalab's largest foreign demo and has manyloyal customers there
Try eBay or there online store
You can probably buy one online
you can get a shirt that says penguin band in club penguin only by buying a toy (real not online)and then when you enter the secret code you can get the shirt for free! you cannot buy the shirt on club penguin anymore because early in 2008 you had to be a member and buy the shirt.
There are plenty of online sites where one could go and purchase a swim shirt. These online sites include Spreadshirt, J. Crew, Epic Sports, and many more.