Some online bonus offers are called reload bonuses, and that's exactly what this question is all about. Reload bonus offers are like first deposit poker bonuses except that they're offered to customers who reload their account with more money.
The offers are generally smaller than first deposit sign-up bonuses, but can still add some money to your pocket. As with first deposit poker bonuses, you should make sure and peruse the terms and conditions for any reload bonus offer you accept.