Canadian veterinary rules (I also believe this is true for the US as well) dictate that a doctor cannot prescribe medications to an animal he/she has not seen. When a veterinarian recommends and/or provides treatment for an animal, a valid Veterinarian-Client-Patient Relationship (VCPR) must exist. A veterinarian must have sufficient knowledge of the animal, including its health status, immunization history, nutrition, management, environment and hygiene, to provide a diagnosis and recommend treatment.
So all that said, you HAVE to go see a vet the first time. Depending on your vet the visit is $50-75, the fecals perhaps $25, plus the price of the medications. Once you have a relationship with your vet any subsequent fecals can simply be dropped off for testing and medications prescribed (if needed) without the in house exam if money is a factor.
It could mean that it’s too cold or it’s not hungry or it’s sick. If you concerned at all about your pet, fill out the health questionnaire (https://www.chameleonforums.com/threads/how-to-ask-for-help.66/) in its entirety and perhaps we can pinpoint why he isn’t eating crickets.