Lowest trade commission is $9.99 (free if not executed within 60 seconds). No additional charge for limit orders. Minimum initial deposit of $2,000 but offers more services for the buck.
http://www.datek.com/
Lowest trade commission is $14.95. Minimum initial deposit of $1,000 ($2,000 for margin accounts). Also provides after-hour trading.
http://www.etrade.com/
