While in Safeway you will also be able to by envelopes, pens, paper etc. so if you need to send a letter and don’t have any supplies they will likely be able to sort you out with everything you need. Many of their large stores also feature USPS mailing services allowing you to attach a postage stamp and send the letter right away. Since the year 2000 Safeway has also began delivering groceries. This means you can have your groceries delivered to your door and with them a sheet of stamps.