Anyone have and use an actual label printer to print shipping labels from varied sources like USPS, UPS, FedEx? The kind that spit out labels you can just slap on a box or large envelope? If so, what kind do you have and what are the pros/cons? I'm ok with the occasional trip to the post office to buy postage for a large envelope, but more than once in a while it would be nice to just print and stick.