Well then don't hold back, because: Insects are not needed for crested geckos.
I bet you're glad to hear that
They do fine on a powdered product that is mixed with water to form a paste that resembles rotting fruit to them.
Think of it as those breakfast shake things, but for geckos.
It's generally known as "CGD" for "crested gecko diet".
These cute buggers are the easiest reptiles to keep other than certain snake species, but even then it's just a tradeoff of only requiring room temp but needing to be fed more often than once every 7-10 days.