Sales Representative. . Goldstein and Charschan Building Products, Inc. (GCBP). is growing and we're looking for an exceptional sales person to join our team in. Farmingdale, NY. . About Us. GCBP is a family owned and operated business. We’ve sold quality commercial architectural products to our clients in the greater New York area since 1956. Our clients include architects, designers, contractors, hospitals etc. . As a company we invest in the f...