Florida has some pretty lax laws/enforcement on pet pharmacies... I don't know how fish falls into that..Awesome thread, never heard of CP before. $180/kg http://fishremedies.com/chloroquinephosphate.aspx that would probably go a long way
Question though @Humblefish if it's something you need to go to a vet or doctor for and obtain a prescription in order to get a hold of the stuff, then why can you just buy it online through the link above?
Petmeds is based from there for a reason, and when I lived in Pensacola there was a pet store that actually had a huge sign on the building "be your own Vet, buy antibiotics, heartworm prevention here!"
that's my 2 cents anyway, based on experience with veterinary stuff