Well BetJm has a $100-$100 Bonus Play offer for new accounts only. If your not there already, thats the best you will find for an established book.
looselines.com had an offer like that ended 9/30...they may still be willing to honor it if you ask nicely...if they dont ask for russ and he may help you out. They are a good book from my experience. RO is kinda high though.
Not sure what Betmanai/betPhoenix is offering these days, they used to have 100% Bonus Play, but I think those days are done with the betphoenix takeover...might call and ask for Fred to see what he can hook you up with.