At TD Ameritrade, sign up for a new account with $2,000 or more and get no-commission Internet equity trades for 60 days for free. (A limit of 500 trades applies.) Plus, get up to $600 in bonus cash when you fund your account with a minimum amount, as listed below. That's tied with our mention from last week as the best such trade offer we've seen from TD Ameritrade. Note that certain fees still apply. Deal ends March 31. The extra bonus amounts: