During the warm season I keep crickets as a staple food, then also get some meal worms about twice a month, and also feed them a few things from outside here and there.
During the winter however, nothing is available from outside and being a very cold location, I need to have live bugs shipped here with heat-packs (1000 crickets).
So it's hard to make variation in their diet over the winter.
Aside from calcium powder, are there any other supplements available to better their nutrition? Any other good things I can dust crickets with for them?



Most bait shops carry these. Also dust the crickets with a vitamin/mineral suppliment if possible about every other week. You can also offer bee moths every now and then; bait shops have these also from time to time. Variety is best, plus it gets them to NOT get too picky. Just tossing around a few ideas for you.