According to the MLS, the avg. 3 BR home in DG is selling for about 93% of the final list price. This varies with the exact type of house and neighborhood, and is probably not your best guage when making an offer. Prices have been falling over the past year, and it has taken some time for sellers to realize how they need to price their homes in today's market. A professional familiar with the area will compare the house you want with similar houses on the market in the neigborhood to come up with a good idea of what the house is worth today.
Hope this helps!