This was actually the first time I ever tried to use the student discount at Jcrew. I actually never even heard about it until I saw it on this thread. I just asked the staff helping me out, "Do you do student discounts?" And she said "Yes," and then didn't even check my old student ID card. When I got on the phone with the customer service guy, I confirmed at the end of the call and they said they would honor the discount and free shipping.
Just found a section about Teacher & College Student Discount on Jcrew website. This discount seems to be honored at all stores. But in the fine print it says that it excludes "third-party branded merchandise." Like New Balances I'm guessing... so I must've gotten really lucky to get a staff member that didn't read the fine print haha. I guess I won't know until I get my order/shipping confirmation, hoping my order snuck through. Here's the link below.
http://www.jcrew.com/help/teacher_student_discount.jsp