disgusting to see this:( I've checked the CITES database, and they have 8 species of baboon listed, all of which are CITES II. It may be worth taking a pic of the critter and sending it to them.
http://www.cites.org/eng/contact.shtml

I'll also PM a couple of animal lovers I know and draw there attention to this thread.

Finally, please noone buy this animal, even in pity. You will just show the shop owner there is a demand for this kind of thing and encourage him to import more. As cruel as it sounds, it's better this one dies in a pet shop, than get's "rescued" by a well meaning member of the public (besides I doubt you want a fully grown baboon running around with the kids at home...all those teeth...eep!)