I did supply when my kids were small and always went prepared with a bag full of stuff, but was delighted if any work was left for me to do with the class.
We have a couple of supply teachers who swan in and expect everything to be ready for them. If it isn't, they go around all the other staff beginning for stuff. It seems they are incapable of looking for things by themselves. When I was doing this, there wasn't even internet resources.
One even came into my class today and asked for stuff and when I said I didn't, she walked over to my desk, looked at some things I had and helped herself to some of them.
AIBU to think this is a bloody cheek? I get work prepared for my class - it's not up to others to do her preparation for her. Nobody minds helping people out but this is getting beyond a joke.