Tired of making that trip to the store just for some stamps? There is prestamped  envelopes that already have a stamp imprinted on them available at the post office..and you can buy post office items online..but unless you have a set of accurate postal scales at home anything other than regular mail in appropriate sized envelopes will have to be weighed for their content and proper postage to avoid items being returned for postage due..or sticking it to the person on the other end.. Also how often do you mail things out other than bills which come with provided envelopes in which you have to purchase stamps for ..Most mail carriers sell stamps and you can also go to stamps.com and purchase stamps delivered to your mailbox..which you can also upload personal photos to create your own personal stamps for a few cents more.. like I did for my grandsons picture on stamps as well as papa and grandma stamps to put on those special cards and letters..