Hey there, sorry to hear that your leos are in such rough shape.
It would help to know what state you're located in, as people on here may be able to recommend a herp vet that maybe you hadn't heard of?
Have you tried www.arav.com
or www.herpvetconnection.com to find a herp vet near you?
I know sometimes you just have to suck it up and drive an hour or two to find a good one.
Anyway, I don't know what to recommend for your leos other than a fecal test for parasites. Are they losing weight? It could be any number of issues with them, from cryptosporidium to MBD to genetic defects.
If these came from a chain pet store originally, I would bet like 99.9999% that they have crypto, which is treatable but not curable.
Are there any dark spots that you can kind of see through their abdomens?
Can you take photos of these guys so we can get an idea of how they look?
Please keep us posted and I wish you good luck with them.
Help! Crested Geckos! 0.1.Leachie, 2.1.1 Gargs, 1.0 Chahoua, 2.1. Blue Tongue Skinks, 1.1. White Lined Geckos, 1.3. African Fat Tails, 2.2.0 Tokay Geckos, 1.0. Giant Day Gecko, 2 tarantulas