Where can I get a weatherstrip for my door that doesn't involve drilling?

I live on campus so i can't nail anything to the door. We have a big gap between the bottom of the door and the floor where a draft comes in. We just want it so we don't get any critters to come in form other dirty people. I use to see a commercial were there were weatherstrips you just slide under the door and it closes the gap. Do you know where i can get one? Please post a link if you know, thanks.
 
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