I am hoping you get a decent salary. If it is under 20 dollars per hour negotiate free supplies to make the samples, don't forget rotary blades, thread, needles etc. Then decide how much your time is worth. Hey they are making money becaause they are not only charging for the class but selling supplies as well. Hoping you get around 40 dollars per hour. If it's just an hour and a half of work, is it really worth committing yourself for 30 dollars.