I'd be interested in hearing from cricket breeders too!

As for the transporting part, I use toilet paper rolls instead of egg cartons. When I get ready to feed I just grab a roll of crickets and dump them into my 32 oz dusting cup. If there are too many, I pour some of them back in their tank. Sometimes my eyes are bigger than my frog's stomachs and I end up dumping some dusted crickets back in their home - they don't seem to mind or be fatally affected by the dusting. I even chill mine to slow them down for the frogs - so they are crawling but not jumping. That doesn't seem to kill them either. They are pretty hardy little creatures.