That is all I have used for 10 or 15 years. Cheap raw prawns. usually the 50 count. When they go on sale I buy a pound or two and bag them in small freezer bags and freeze them. About 6 or 8 to a bag. I don't even thaw them out prior to fishing. Just pull a piece off, about the same size as your corky, hook and egg loop it. The water thaws them out instantly.
Steelies, springers and chums hammer them.