When I've made candy apples for my family I just used some Brach's cinnamon disks and water and called it a day. Well now I have a request for 150 of them! Yikes! That seems expensive to do. Would the karo syrup method with cinnamon lorann oil do the trick too? I think that would be less expensive. What do you think?

I don't know for sure, but I'm pretty sure it wouldn't. It seems like it would be too soft. Have you tried googling a recipe for candied apples? You might be able to come up with a home-made coating that would be a lot more cost effective.