Check out your local second hand stores and garage sales.

I never have much luck shopping in these places due to my size 6'1" and over 250# or a size 20" neck and 36" sleeve.
However, if you are a "normal" size you can find great deals on lightly used clothing in these places that still have plenty of life left in them.
You will be surprised at the name brand clothing that you can find in these places.