Here is a website that you should check out if you want to give your mali a good life.
Deer Fern Farms Home Page: Uromastyx, Tortoises, Spinytailed Iguanas, Bengal Savannah cats
Doug has raised uros for many years and is one of the experts in America on these reptiles. He also sells supplies specifically tried and tested with favorable results on his uros. I use the uro dust, Miner-al and Mazuri tortoise diet as an important part of the diet I feed my egyptian uro. If you do choose to feed crickets, it is recommended by many not to feed them very often, rather only as an occasional treat. Again, read the caresheets at deerfernfarms for a complete diet recommendation as well as caging essentials and general care. Good luck with your new uro. They are great lizards.
Craigo