All of the above - it's never too late to learn an instrument. I took up clarinet and saxophone in my 30s and have never looked back.
I suggest you visit a local music shop and see if any teachers are advertising, or if the music shop carries a list of local teachers. Also, if you have a professional orchestra in the vicinity, contact them too. Professional musicians don't earn a lot and many supplement their income with private teaching. The reverse of this, however, is that violinists are more in demand than, say, woodwind players due the sheer numbers required in most orchestras, so you may have a lengthy search on your hand.
Finally, think about placing an ad somewhere like the student union noticeboard. There could well be an experienced musician among the student population who'd be willing to teach you for a lot less than some pro teachers. You'd have to be wary of bad habits etc., but it would be a start.