The Puffer Forum

Formaldehyde; this alone can kill puffers. This medicine is not safe, make sure you put some carbon in your filter to wipe it out of your system, in addition to a large water change. Remove the carbon after a few days.

Ok, so you are probably going to have to order something if the medications in your store don't contain praziquantel or metronidazole. This is the only effective and safe way to treat internal parasites.
Here is the procedure to treat ich, please follow it exactly paying close attention to amounts and temperature:
viewtopic.php?f=3&t=28113&hilit=+Heat+salt
Here are some medications you can try to find for IP's:
Seachem Metronidazole
Jungle Parasite Clear
API General Cure
Tetra Parasite Guard.

as far as the scraping goes i noticed my fish doing that a bit so i did an earlier than scheduled water change assuming that would help, or wouldnt hurt, but i got a case of ich. luckily not one death though because i watched them like a hawk and noticed at the first sign. so on top of what everyone else is telling you (definitely more important than what i am), keep a close eyes on their fins especially for ich. the sooner you see it the better you can deal with it.