Betonusa.com offers a free $50 to "some" new clients. I think if you call them and ask for the $50 promo, they'll give it to you, providing you're a first timer...Have to take it up to $500 before withdrawal.
BTW, SBR has them rated a D+. But there is no justification for it. There are, and to my knowledge never has been, ANY COMPLAINTS against this outfit. My experience there was very rewarding; and they PAID ME PROMPLY. GREAT CUSTOMER SERVICE. Do a search on them here