Perhaps the facilities at which you will be doing clinicals mandate all student nurses have the flu vax, and the school's administrative paperwork has to be in to the clinical sites by sometime in mid October.
Are you talking about the H1N1? Or seasonal flu? If you're talking about seasonal flu, I'm surprised no one has any vaccine in your area. I'm in the midwest, we've had it for at least 3 weeks. In my area, the pharmacies at the grocery stores and places like Walmart and Walgreens have been giving them out for some time now.
However, the H1N1 vaccine has yet to reach my area or to be distributed to even us health care workers.