Since you have a ton of other herps i'm guessing that you use a lot of adult crix. For food I have a good idea... get some of the little conainers that they use at take out places for dip, etc (if you can, or cut the bottoms from deli cups, or use the tiny cups you use to rinse your mouth at the dentist... you get the idea) and just fill them with dirt, or something, and put them in with your adults. That's what I do to feed my brev's. I feel ripped off paying for pinheads... They take nothing to hatch, it's the raising them to adult size that makes it worth buying them... You've probably thought of this already, just thought i'd mention it in case...
Also, leave out a piece of cantalope in a clean pickle jar. I don't know what it is about it, but when ever there is some in my garbage the fruit flies INVADE my house... You can probably get quite a few, and keep a colony going for a few weeks. Using bamboo pokers helps, you can change the fruit everyother day to prevent mould. (soaking it in lemon juice allows it to stay good longer than two days, fyi).