Where are you buying your CP? I cannot seem to find it.
It's pretty hard to find. I was lucky enough to buy some from a fellow hobbyist in my area. I have no idea where he got it from. As mentioned above, your local vet might be able to help you. I also found it here but they sell it by the kilo:
http://www.fishchemical.com/Products-CHLOROQUINE-PHOSPHATE-1-KILO-22937.Item.html
Some people substitute Quinine Sulfate for CP. I've read that it's just as effective, but not as easy on the fish as CP. This was actually my backup plan until I found CP. You can find that here by scrolling down until you see Quinine Sulfate:
http://www.fishyfarmacy.com/products4.html#Q
http://www.americanaquariumproducts.com/AquariumMedication2.html#quinine