From BarCampBank's Wiki

Comparison of transfer-out fees of US-based investment firms:

• Bank of America: $ 75
• Charles Schwab: $ 50
• E*Trade: $ 60
• Fidelity: $ 50
• Firstrade: $ 50
• Just2Trade: $ 75
• Merrill Lynch: $ 75-100? (affiliated with BofA)
• Muriel Siebert: $ 50 (retirement accounts only)
• OptionsXpress: $ 50
• Scottrade: $ 0
• Sharebuilder: $ 75
• SogoTrade: $ 50 or 75?
• TD Ameritrade: $ 75
• Tiaa-Cref: $ 0
• TradeKing: $ 50
• WallStreet*E: $150
• WellsTrade: $ 95
• Zecco Trading: $ 50 or 60?

Firstrade, Scottrade, Sogo Trade and possibly WellsTrade all have an incentive to switch to them: reimbursement up to $100 of transfer-out fee when transferring at least $25k to them.