help: looking for cheap local vacation rental ideas

howdy

looking to go away with 4 girls for a weekend at the end of september, anywhere within about a 3 hour driving radius is totally fine (train accessible a plus but not necessary). looking for a pretty, natural spot. I know there are some great deals around since its a little more off-season and the economy sucks, but I don't really know how to go about it. Anyone have any advice? Stayed at a house before you really liked that you think I can negotiate? The cheaper the better and we dont mind sharing rooms - don't need more than 1+fold out couch or 2!

thanks a lot
laura