I am only 17 and going to be in yearbook for my school next year. I am hoping to catch someone selling a 70-200 f/4 L to upgrade to one of the higher models of this lens (f/4 IS, f/2.8, f/2.8 IS). I do not have a lot of money and cannot afford this lens new. I am hoping someone is willing to help out a student. Retail MSRP is approx $570 I am hoping for a price in the mid to low 400s or (unlikely) if someone is generous to go lower. Please contact me if you are considering selling one of these lenses.