Can be ordered on line from USPS.com
They have Flat Rate Legal Size envelopes- shipping rate same as flat rate envelope
They also carry Flat Rate Padded Envelopes at no charge as well
https://shop.usps.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10001&storeId=10052&categoryId=10000036&langId=-1&parent_category_rn=10000002&top=&sort=&viewAll=Y]
https://shop.usps.com/webapp/wcs/sto...ort=&viewAll=Y[/url]
If you set up an account - you can order them on line & they will ship them to your home at no charge