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Where Doors and Windows are On Sale Everyday. Since 1976, Concept 76 Discount Window and Door has supplied thousands of satisfied customers with bargain-priced building products related to windows and doors. From day 1, we have been, and still are, a FAMILY-OWNED, FAMILY-RUN business, with a combined 80 years of experience in the field of door and window products. At Concept 76 Discount Window and Door, you will get personalized, knowledgeable service, with on-the-spot quotations!