You can just get a dark colored bin at Walmart for less than $10. You can also use a human heating pad, just be sure you get one that doesn't have automatic shut-off. I use a Sunbeam brand that I got on Amazon.com. I make my own "chow", and you can get plain, clear water crystals really cheap at places like Lowes in the plant section.
Dubia are super easy to raise and keep your feeding costs low. I have 2 beardies, 1 is a juvenile, and they love them. My colony has definitely paid for itself!