"Urban" is pretty loosely defined, although you might find a few acceptable options here. I saw they have a techwick polo shirt for about $35, plus if you're ok with plaid, there are a few options in short sleeve that appear to be made of moisture wicking synthetic fibers.

http://www.ems.com/family/index.jsp?categoryId=11302106

You might also try campmor.com, rei.com or sierratradingpost.com