there is a good lesson for you in this however. As people have stated multiple times on this forum. Be careful when buying from a chain store. Make sure they are alert, moving around etc.
If this is 100% petsmarts fault, and you noticed it had all the symptoms of mbd while still @ the pet store, why would you purchase it? Considering it sounds like you are a new owner.. why would you believe you could help a beardie in such bad health as you claim.
also, you said this about 5 days ago
"Ok well there is nothing worng with my bearded dragons but I keep thinking there is even if there is nothing worng and I getting stressed when they get stressed and I can't stop stressing over them cause there my first bearded.dragons"
So.. in 5 days one developed a HORRIBLE case of mbd and died from it? I have my suspicions