Hello, I jus wanted to say that a few weeks after I bought my Agama from my local pet store, I had noticed that she had mites. Being new at owning a reptile, I asked for advice on how to treat her for them.
I was told to us mite spray, so I went to the petstore and purchased DE FLEA Reptile Reflief by Natural Chemistry. Instead of spraing it on, I dabbed it on the mites with a Qtip, almost right after application I proceeded to gently pry the mites off her with tweezers to find that they were indeed dead!
I then went on to empty the sand and take out all her logs and rocks to bleach everything out. This one imparticular brand I have says you can also use it to treat in and around the terrarium.
I was also told that dabbing some olive oil on the mites with a cotton swab kills them, scince they suffocate(and the oil is not bad for your reptile). Soaking in lukewarm water is also good. 
Anyhow, hope this helped....
~Schizmsgrl~
Gypsy and Jackson

-----
1.1.0 Canine, Cody & Mosely
0.2.0 Feline, Nikkita & Samantha
1.0.0 Cockatiel, Jerry
1.0.0 Parakeet, Keet
0.1.0 Agama, Gypsy
1.2.0 Kids, Kyle, Kristen & Cassidy
1.0.0 Husband, James