Speaking from the vantage of having worked in the retail pet industry I shall share some info:
Large discount retailers like Petsmart and Petco long ago sold their souls to jump into the multi billon dollar profits the North American pet industry offers.
In doing that, they decided to sell mostly dry goods. This results in lower overhear but maintains profits. Where pet stores lose their profits is when they have to care for animals and all that entails. As such, any of these stores simply offer dry goods cheaper than the local reptile store. Over years of this however many small specialty stores went out of business. Since you can't sell dry goods to customers if they don't have a pet, the large retailers started selling animals but in keeping with the high profit mentality, the animals don't tend to be as well cared for nor do the employees tend to have much experience to share. A classic example of cheaper is not better.
As a matter of just principle, I always buy my reptile equipment from my local reptile shop. If rather save my solid reptile shop over saving a few bucks.
In just looking at the photos I can see numerous issues. There seems to be MBD, additional vitamin deficiencies, and even some injuries to the chest areas from mishandling. If you are going to pull it off, saving that one critter, you are going to need a reptile vet and a good one at that.
Take good photos of the animal, return to Petsmart, and get your money back so at least they don't profit from this. As for a learning experience, now you have a good idea of what not to purchase when looking for a Cham. This is not being mean not sarcastic. The simple truth many Cham owners have in common is that at some point in our hobby we end up seeing a poor animal like this and learn from it.
I wish you good luck in helping the animal, never give up since some you will save.
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