I've begun tackling this bonus, along with the October $100 by playing micro NL tables.

I've read that some users have claimed the bonus this way, but some haven't. My rake counter on the main screen has been going up steadily, although painfully slowly at these limits, (My bankroll is small. Lots of funds tied up from Boss sites atm.)

It's worth a shot at lower limits, at the very least the tables appear to be pretty soft.