You want to make sure that the ones you feed your Chameleon are properly gutloaded. If for example you just let them sit in the cage for a couple days(not saying you do) its not only bad as they could start biting your Chameleon at night when they sleep but then they loose most of their nutrition. That is why it is important to gutload them for 24 hours before feeding and the crickets your Chameleon doesn't eat that day take out and make sure they feed again.
Buying and maintaining a cricket colony is not that much time, money, and does not take that much space. Really you just need two bins, one for the adults and one for the babies. Some organic dirt for them to lay the eggs in and some organic food. You can just cut holes in the sides of the bins covering with screen and you can stack them. It will end up saving you a lot more $$ and plus you can even make money as they will have TONS of babies you could even sell. JMO