I'm afraid I do like a flutter but, as a teacher, I can't afford to spend more than a few pennies (literally) each week. I decided to introduce this idea to the classroom. I've only used this in my Year 12 English Language class but I expect it could be easily applied to most classes and would result in interesting conversations in most contexts.
It allowed my Year 12 class, who have target grades from A-D, to choose the differentiation they required. Each scaffold was given 'a mark'. These scaffolds included being given the mark scheme, getting examiner comments about successful responses and working in a pair. There were about ten different scaffolds available and each scaffold would cost the students marks in their final mark for the question from 2 marks for the least useful scaffold to 20 marks for the most useful.