[TD Ameritrade]
You'll automatically get up to $1,000 when you open and fund an account with a qualifying deposit.
$1,000 cash when you deposit $500,000 or more
$500 cash when you deposit $100,000–$499,999
$300 cash when you deposit $50,000–$99,999
$100 cash when you deposit $25,000–$49,999.
TopCashBack isn't currently offering any incentive for refereees, but it's a good site that guarantees it will beat any other cashback site.
"At TopCashback we promise to not only match the rate you have found, but beat it by offering 110% the cash back rate of whatever our competitors are dealing", .