That particular shirt is a teaser of sorts. I think it regularly goes for $14 or so. In fact, it's my least favorite shirt from them - I've found that by buying the brand name items (Adidas and Nike for example) you get top quality products and you sport your business logo at the same time.
They carry Dickies too. They do tend to send a lot of email/spam advertising sales, but if you're patient, you can get what you want marked down pretty good.
571 250 9650 VA
240 398 3800 MD