It is called an Acid-fast stain. Wow, only $16 here
https://vetmed.tennessee.edu/vmc/dls/Documents/FeeSchedule_Apr2014_r2.pdf
I am going to call some of the vets in the area tomorrow and see how much they charge for it and check out any local animal labs here, for pricing too. That is SO worth knowing.
Checking on treatment costs now.
EDIT: They are all prescription (I figured, but it didn't hurt to look) -- looks cheap in the UK, I don't know if those were scams though. I don't know about in the US.
EDIT: The more I am reading about this, the more it looks like it is a REALLY good idea to just get a full fecal test on your geckos. (Do the Fast-Dye) There is a good chance of catching it early or at least having peace of mind that everything is okay. And if you get a new gecko, do a fecal along with your quarantine ASAP. I'm going to see about getting it done tomorrow :/ I'll also ask about crypto treatments and cost while I'm at it.
EDIT: Another tidbit... -_- Cryptosporidium was the leading cause of waterborne illnesses in 2003 because of inadequate water purification in various parts of the US. This is ridiculous :/ I used to raise my eyebrows at one of the gecko breeders recommending only purified water and not tap water, but I guess they have a point.....
Okay, I'm moving off of this topic now. :/ Back to diggin'....
Happy thoughts... happy thoughts...