Cardboard packaging

A teacher at a local school contacted me recently and asked how much I charge per session as she would need to ok it with the head teacher.  When I told her my price she booked a full day immediately....... I am clearly very cheap   :-) It is just as well that I don't charge for the hours and hours of time that I spend prepping for sessions.  I have spent most of this morning cutting up cardboard packaging to use as a resource........ well it would have been a shame not to really now wouldn't it?   :-)