10k ClickRewards for opening a Cititrade account with a mere $10k
http://www.clickrewards.com/offers/cititrade.html

* This offer is available to all Cititrade accounts, except for retirement accounts. Citigroup employees are not eligible for this offer. Only one Cititrade account per household is eligible to receive this award. This offer cannot be used in conjunction with other Cititrade promotional offers to obtain multiple awards. To receive the award, the client must deposit $10,000 into a Cititrade account. He/she must maintain such amount in the account through the time period the credit will be made and execute at least one equity, option, or mutual fund trade (excluding money market funds) during such time period. The client's award will be credited to his/her ClickRewards account within 8 weeks of opening and funding the account. This offer may be terminated or changed at any time and for any reason without notice.