Where to advertise an open position?

Using Monster was not useful (we got flooded with generic web/jscript/drupal/wordpress applications).

Is there somewhere to post junior or senior AS400 positions? COMMON? Ocean?

EDIT: HR is requiring relocation, which caused several senior people who applied to withdraw. That's one reason we're now looking for a junior, figuring they'd be more open to that.

CLLE, RPG4/free form, lots of sql, a little php. Passing familiarity with RPG3 helpful.