Many of the 919xx zip codes are in the red zone so to speak. Of course there are many many others in the red zone as well. In spring valley if one bought a home there in the last 3 years more then likely that home is worth less then it was at the time of purchase.
If you want to look at bank owned properties go to a website called http://www.reotrans.com as opposed to the other site mentioned in this thread. Also yes you can find the previous price for any home. Go to sdlookup.com. Or post it here and many a poster will help you out.
