Hey,good luck searching man, I totally feel for ya, I live in the Bay area, but going to school in Davis (mooo), but yeah, I know it can be a pain in the ***. I just got mine not to long ago ( white 1990 240sx fastback, all options w/o the hicas package : /, but with only 112xxx miles at the time). Got it from a buddy of mine, but yeah, they're out there. Another thing you might to consider is what kind of condition you're looking for, like if you're planning on a sr swap, a good motor may not be something you're looking for and therefore could cut costs. But yeah, a good place to check is
http://www.craigslist.org, always got a number of 240s that are local to Bay Area and lower Sac region. Good luck on your search, keep me posted on your progress, when my project's done we'll take quik silvia's offer and go Honda tormenting. But yeah, I feel for ya man, what school you going to btw?