Business envelopes from the Supplies Shops are the perfect envelopes for your office. These versatile envelopes come in a wide variety of colors and sizes to fit your specific needs. Shop for window or windowless business envelopes. If you can't find the business envelope size or color you're looking for, contact us and we'll be happy to help you! Order envelopes for your business in bulk and save with free shipping on all orders over $99.