Shipping Orders from EBay

Previously ran a small eBay account selling singles. My previous method of shipping was; pack up, visit the post office, they scanned a QR and printed a label then took it off me to ship.

Unfortunately, my local post offices are unreliable while their opening times, and my work doesn’t allow me to visit the depot. So it’s a challenge to ship things with the current arrangements.

I was wondering if there was an easier way to do this? Stamp and post box? Label printer at home?