Direct Label Supply have been making my labels for 20 years and have kept the printing plates on file for me all these years. After the initial set-up of getting the printing plate made, it's really cheap to get a thousand or two labels printed. Last time I had a thousand done (about 6 years ago!) it cost about $85AUD (and gets cheaper per-unit as you increase the quantity of your order).
...
If it's small quantities you need, the wonderful Maya has these tips and tutorials on making your own, and I know there are other companies specialising in short runs... I just have no experience of using them. Do you?
I thought I'd open up the comments here for you to share any information you might have about where you get your labels made, or links to tutorials on making your own. Anything that might help people seeking information on the subject.... I'm sure it'll be greatly appreciated!