Here are two books that I use. Please post if you know of any good promotions.
wagerweb - 100% bonus (free play $) 15x rollover on any deposit over $500. If you are a good customer they might give you 200% free play bonus, but the rollover is like 35x.
Gtbets - 50% real $ bonus on up to max of $500. So if you deposit $1k you can get $500. Rollover is only 4x.