For parcels I use Interparcel online , one can pic and choose the carrier and the price you want to pay per item. One then arranges for the carrier to pick up the parcel/s from your location and some (if you have no printer like me) will print out the address label for you.
I sold my new unused MXUS freewheel hub to a forum member and it arrived the next day after pickup.
One of my inkjets printed, then spat out a cog on the paper - given their many problems and ink/toner cost, I can see why many choose not to buy a printer. Folks use a friend's, ones at the library or print shop if necessary I guess. I used and bought every type of professional printer when I managed IT for a magazine and book publisher for a couple of decades, saw over 20 years of professional printer development, but the one I use the most for printing documents and code now is my old dot matrix Epson LX400 from 1980. Here's one in a museum:
Epson Dot Matrix Printer, Model LX-400, and associated parts, used with the TRS-80 microcomputer system (HT 1839). This printer and its associated items are part of a collection of hardware, software, personal notes, trade literature and promotional material that was donated by their owner to...
collections.museumsvictoria.com.au
Every several years or so, I buy a new compatible ink ribbon for a fiver. You can pick up a trusty old Epson (stick to Epson when buying dot matrix, rock solid are Epson dot matrix) on ebay for about £70 or less. There are USB to Parallel Port adapters if your laptop doesn't have a Parallel Port (most modern laptops don't) which need a tiny bit of configuration, I've always been able to make port adapters work with all laptops and PCs so far. As you know I haven't got neither want Windows 10, but might have to use it someday soon, will try it on Win10 if needed.
Alternatively there are also the very reliable and also cheap to own and print thermal printers - you can buy mega cheap till rolls of thermal paper. You'll print many many miles of paper before the heads need replacing, which is why thermal printers are used in tills. Shops go out of business and their equipment liquidated or landfilled before thermal print heads fail. Bluetooth thermal printers can be bought for about £20 used. Avoid the ones which use batteries, because as you know batteries can screw up, be hard to source, proprietary etc. etc. That being said, I've managed to short a couple of pins (using my new and increasinly excellent soldering skills, thanks to the helpful advice received about soldering from the many soldering maestros on this forum) for the battery on some mobile thermal printers, so that they work using external power exclusively - that certainly works on this one for example, which can be bought cheaper:
Diversified compatibility - Bluetooth receipt printer compatible with android and iOS, small size, lightweight, wireless design, simple connection, easy operation and maintenance.
www.ebay.co.uk
You can simply copy and paste or type postal addresses into a free Android app on your phone and print. No need for sticky labels, you can print on cheap thermal printer till paper rolls, cut (some autocut, or you can tear off and tidy) to sellotape onto letters and parcels.
Print text and images with bluetooth thermal printer!
play.google.com
There's no ink dry up or leak all over the place (particularly nasty if using huge plumbed in ink bottles for separate colours... the horror... I still haven't recovered. It was a flood!), thermal paper darkens with heat from the print head. The print heads can last decades.
However, thermal prints can fade - a characteristic Computer Exchanges (Cex) intentionally use to their advantage: they print vouchers valid for a thousands of years or something, but they fade in about two. Deffo take a photo of your Cex till printed voucher the moment you receive it lol.