I ordered some self-adhesive round labels from eBay but suddenly realised that they would probably be a pain to get off again! However when they arrived it turns out that they are "budget" labels, shall we say, and the glue is not too strong. Having said that, the quality is fine - they aren't rubbish.
Of course they come on an A4 sheet so are easy to print. I can't be bothered to do artwork so I find the logo or label on the internet or photograph the kit label. My 6-year-old won't let me stick the labels on, they insist on doing the lot, so I don't even have to do that.
All very easy, the only fiddle was getting the template right so the printing lines up, but you only have to do that once.
So if you're a lazy labeller, this is one option to consider. If you don't have a 6-year old to stick the labels on, you can borrow mine.