A good deposit bonus is at Hollywood poker. You do have to deposit money to get the bonus, but it is a
500% bonus, up to a maximum of $1000. So, a $200 deposit qualifies you for the maximum $1000 bonus.
The catch is that the bonus is paid in $50 increments as 850 Poker Points are earned. You earn .07 points for every 10 cents of rake on a hand which you are dealt cards. You only have 2 months to earn points before the bonus becomes invalid. Honestly, you likely need a larger bank roll than $200 so that you can play high enough limits in order to earn points fast enough. It would be a nice way to supplement Evman's and Grunt's roll building techniques once you have a decent roll, or if you feel like you can gamble with some money. On the other hand, even if you play at lower limits where the rake is lower, you can still earn a portion of the $1000 at the $50 increments.
Hollywood poker can be found here. It is a decent site. It shares the same player base as PokerRoom. The downloadable software is really good. The online mode offers a Java applet from which to play. There is a good selection of limit, NL, and Tournament play. I play there often, and do quite well.
If anyone wants to sign up, send me a PM, and I can Refer-A-Friend you. We split $150 bonus; $50 gets split when you earn 150 points, and then the remaining $100 gets split when you earn another 150 points.