Create a caricature

I am looking for somebody to create a number of caricatures for me. I am a Junior School class teachers and would like to us these caricatures to bring a little more interest to the classroom presentations I make to the kids. As a result, the drawings would be delivered in digital form.

Each of the caricatures would be of me, in suit and tie, in a number of different positions - pointing at whiteboard, holding up a sign, etc.

Ideally, I would like to have 4-6 of these caricatures done. However, I am working with a budget. Given that each of the caricatures is of the same person, I hoped that this might reduce costs a little.

Would you be able to provide me with an estimated cost for 4 and 6 of such drawings?

Many Thanks,