http://www.antibodies-online.com/ you can find many rabbit abs there as well. Not sure whether they are monoclonal though, usually rabbit is polyclonal.
We've had GREAT experience with CCRC (Georgia Univ); http://www.ccrc.uga.edu/~mao/wallmab/Personnel/personel.htm. They mainly focus on carbohydrates, but not restricted to them, from our experience.