Necroing 7.5 years later because now I'm running Jade Regent.
Bestiary Box 3 has 2 dire corby pawns.
Hell's Rebels has 1 dire corby pawn.
No plastic/metal miniatures exist for dire corbies to the best of my knowledge.
Jade Regent's biggest dire corby encounter requires 4 dire corbies, so one B3 box and two Hell's Rebels sets would have a DM covered.