Carreer options, what to do!!

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As the last part of my education we have a 7 months internship. I got my first offer a week ago, but the problem was that I was only offered $300 per week as opposed to my two male classmates that were offered $500 per week. We have the same grades and otherwise equal qualifications. I responded in a polite way if there was a possibility of receiving $400 per week instead, and since they haven't responded since, I think that I lost the opportunity. I guess it I shouldn't have asked for a higher pay since I didn't have any option yet, but I'm annoyed that they offered the guys so much higher starting pay. What would you have done?