try not to buy from a pet store if you can help it,plus imo its better to start with a younger cham so you can build up a relationship with it and it would probably feel more rewarding,just my own opinion though,and welcome to the forum by the way:)
i have that problem with locusts,every time one jumps out of the box my cat always manages to get it before i do and runs away and eats it,shes a total dustbin and will eat anything lol.
im currently using a 100w mercury vapour bulb which im told gives out uva,uvb and a good heat supply,ive been using it since i got rico about 18 months ago,my question is how often should it be changed,cos its about £60 a pop depending on where you go.