LocalBitcoins is a marketplace for trading bitcoins locally to cash or online payments of your choice. - Accepts US residents!!!
CoinBase probably the biggest bitcoin wallet website where you can buy bitcoins using your bank account (free 1$ worth of bitcoin after verifying your account!!!).
CoinMama offers Bitcoin buyers with an easy, fast & secure way of purchasing Bitcoins (use 744XX276 coupon code to save!). - Does NOT accept US residents!!!