try giving him this linked below as it has all the vitamins etc he needs
http://www.ebay.co.uk/itm/Repashy-Cr...item641f7683c8
once he is consistently eating that, you can introduce him to gutloaded crickets dusted with calcium dust, komodo calcium or nutrobol, you should be able to get quite easily. , as coming from a pet store could well be malnurished
Take him to a good reptile vet asap.
Pm me if you want to discuss anything further, or post in this thread