Shop for window envelopes from the Supplies Shops and find the perfect business envelope for your home or office. Browse over two hundred window business envelopes in a wide range of colors, sizes and styles. Window business envelopes are ideal for all types of business correspondence. If you can't find the window envelope size, color or style you're looking for, contact us and we'll be happy to help you! Order window business envelopes in bulk and save with free shipping on all orders over $99.