Best place to get crickets?

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Every place I looked listed their diets as being "crickets, mealworms, wax worms, earth worms, small feeder guppies, and bloodworms" .

Crickets are the mainstay for my FBT's which have been in my house about five years. I tried mealworms and they are not lively enough to attract their attention. Their shell seems too hard and actually feels sharp on the edges. So I've nixed them, maybe I had them at the wrong stage in their lifecycle. An occasional earthworm that's wriggling does get their attention, and I am considering guppies if I ever get around to building a bigger viv with much more water.

And with crickets, your FBT does get a variety (somewhat) if you change the crickets diet. It's what the cricket has been feed that nourishes the FBT just as much if not more.