When it comes to expenses and lizards, I consider the cost of UVB bulbs and heat products and the ongoing electricity costs above the cost of food.

I feed leos, tiger sallie, water dragons, and my single bearded dragon off of my dubia colony. I feed the dubias various mixes of extra cat food, dog food, left over salads, garden scraps, weeds, etc. So they are basically free after the initial investment.

My beardie loves dandilions as well. My yard is overflowing with dandilion and other healthy weeds (like plantain, clover, etc) year round. So I spend very little on my beardie for his salads. And he get's a few adult dubia a day.

The most expensive reptiles I own are my snakes and the frodents I have to supply them with.