Here is a list of all the new construction developments in Mahopac: http://www.miketrinch.com/mahopac-new-construction.php
For a house that is completed and no further upgrades negotiated, you will find nice discounts under asking. Even houses not built yet, the builders are offering great discounts on upgrades.
I work with builders who have vacant land to build on and can custom build you a house to your liking and for a good price, these homes are not listed online so feel free to contact me for further info in regards to pricing.
If you need anything else you can reach me at Mike@MikeTrinch.com
Everything is negotiable but be aware interest rates are very low. Its the perfect time to buy if you are in the market and at the price you can afford. $8,000 tax credit helps too. You can check out and see what the other units have sold for too, most recent sales should be used to make a judgment.
Best of luck
J Douglas Montgomery
Broker/Owner, HomeNY Corp.