While it may be better not to buy or to buy secondhand, sometimes you just have to buy new (food and gifts, for instance). When buying new, why not shop Fair Trade? According to Co-op America: Twelve Ways to Shop Fair Trade Now:
"The Fair Trade marketplace is broader and more vibrant than ever before. That's the lesson our editors learned while putting together our latest Guide to Fair Trade which makes its debut as a 24-page online PDF." Check it out for yourself, and ask at your local market for fairly traded items.