Calci Worms are another great livefood. They are black soldier fly larvae and are very popular in the USA.
They are high in fat, protein and store calcium very well.
These are best kept on a food substrate such as Bug Grub and should be kept at room temperature out of direct sunlight.
To keep them longer consider moving them in to a larger plastic container such as a Breeding Box,
You should use calcium or another specific supplement to dust with before feeding.
Gut loading with food will not only improve the life span of the locust but us also very important for the nutritional value.
If they have been out in the cold them warm them up slowly, don't put them on a radiator or near anything hot.
Useful livefood keeping products:
All prices are in GBP