Barack Obama Doesn't Shop at Wal-Mart and neither should you.
His reasons? Wal-Mart is anti-union and treats its employees "shabbily". Works for me.
Note, if you shop at Wal-Mart because you have to because of economic constraints then I honestly have no issue with your doing so. It is when people of greater means that can afford to shop at less exploitative places of business that I have an issue. Studies have shown that Target's prices are as good or better than Wal-Mart but that people feel like Wal-Mart's prices are better because the stores are not as well kept (no lie, people equate lower prices with messier stores).