Unless you need the convience of Postnet, I would suggest using the post office. Postnet charges a very steep fee which makes the cost about twice that of the post office. The clerk placed my shipment in an envelope and sealed it, but when I found out the cost was going to be twice the cost of the post office, they still made me pay for the shipping envelope even though I wouldn't ship it there and I hadn't sealed it. Bad service and very expensive.