Well, as you plan the 2 cages remember you can save a little by putting them side by side (with a simple visual barrier between such as a piece of opaque plastic sheeting), use one longer UV fluorescent tube stretching over both, and one basking floodlight placed over where the 2 cages meet so both get the heat from one fixture. You can set up a fogger or mister that reaches both cages, and even combine under cage drainage that way. You'll end up with a larger "divided" cage rather than two separate ones.
Still, please offer the shop good husbandry info and ask that they make it available if they sell any chams in future. Hopefully they will be open to learning more about them.