in fact there are TONS of free plugin ins out there. problem being most of them are VST. not so much of a problem if you get FXpansion's VST to RTAS wrapper though. Then you can utilise sites such as vstplanet.com and many others. Do a Google and see what u can find
also digidesign have some on their site! check out the bomb factory ones here
http://digidesign.com/index.cfm?&key=/products/details.cfm&itemid=4201&template=overview&langid=1
and EQ III here
http://digidesign.com/index.cfm?&key=/products/details.cfm&itemid=4562&template=overview&langid=1
hope this helps!
andy