I live in MA and just finished a review of the Penguin triple pane window. It was very impressive window but the cost is a bit much to handle. Does anyone know what the mark up on replacement windows is and is there any reasonable way to negotiate a more reasonable price for them. I am not looking for an inexpensive window but I sure want to make sure I am getting my money's worth. Are triple pane windows the way to go or are double pane adequate for the northeast (as the price of oil keeps going up, up, up !!!!