You probably will not be able to get much off the price-- $10,000 to $20,000-- Properties are price in "as is" condition... the is usually a "good value" there... all though not always. A Buyer's Agent will be able to tell you if the price is good or not... and should be doing a CMA for each home you think about making an offer on. These homes however are not always a "good" price... sometime the cost of putting the home back together will not make the home worth it, and my advice to you is to move on and watch the property... Banks will reduce the price (usually monthly, but not guaranteed)... so walk away and wait until the home is worth it to you. Many times the person telling the bank what a home will sell for (Broker's Price Opinion or Appraisal) is not from the area so doesn't really know the value a home should be.
So figure out what the cost of repairs will be (about) and the cost of the house, plus any "surprises" (with a bank owned there is always a surprise or two).
If that cost comes out to be a good value then go for it... if not, walk away.
You can also get an FHA loan to help with the repair cost... it is a 203K and will allow for up to $35,000 in repairs for the "Streamline" loan... which is what most banks are offering now. A simple loan, runs under the same guidelines as an FHA loan... takes a bit longer to close (you will need contractor quotes... which is painful to get and can take a while)... but the good news is you don't have to worry about how you are going to fix what you just bought.
I work in the Dartmouth area and would be happy to answer any questions... If you have already bought, congratulations!
Bartlett Realty Group