Everybody I talk to seems to be SHOCKED that I'm not planning on buying a breast pump right away, but my nurse practitioner said she didn't think I needed to start out with one because of my school schedule and the fact that I get off 1 month for Christmas break. She said just to wait and see if I felt I needed one in the spring.
I'm not getting one until I'm sure I need it. I asked on the bf forum and a few people said that you should avoid using one until about 6 weeks after birth anyway to let your milk supply adjust. Up until then you can always hand express if you need to.