I just picked up one of these lenses for my D90. I have two rebate forms, one is a general rebate that Tamron is running right now for $100 and the other one is a student rebate for $50 off. I am confused about these two rebates. I only have one UPC code on my box, do I send it to the $100 rebate address or the $50 address? The student rebate includes in the options the $100 general rebate plus the student rebate as well for a total of $150. Has anyone done both rebates before? If so, how did you mail them in?