We use,
a combination of
Guppies, Tuffies, and grass shrimp
Guppies are good because they will live longer in salt water, Tuffies are cheap ~$.10
Grass shrimp should become available very soon at the bait stores
Once they are eating good on live you can try any of the above on a stick and eventually they will eat frozen or freeze dried right out of the water column.
I would never go 100% away from live because you can "gut load" them with vitamins other high nutrient foods or even meds if needed.