Try the http://www.frogforum.net/vivarium-te...owl-trick.html Either put the crickets directly in the dish, or bury the dish so it's lip is level with the substrate and use it as a pitfall trap for the free range crickets so they don't get to roam indefinitely.

You can also try wax moths as an enticing food item (they're the adult form of the readily available waxworms).