Existing users, 
The freeware mentioned below by user Stormchild has last been updated in 2002.
a.) It does not create codes with Addon that you need for ISBNs.
b.) Obviously, it also does not create the new ISBN 13 barcodes (which have been introduced only last year).
c.) It does not create CMYK output which you need if you want to professionally print or typeset barcodes without prior conversion.
Wolf Software
http://www.pro-barcode.com
Barcode Blitz
Creates EAN, ISBN 13 barcodes as EPS / TIFF
Version: 2.0a
Comment below is misleading
Feedback Type: Developer Note
Contributed by: Tuesday, September 05 2006 @ 07:49 AM PDT
Product Platform: MacOSX
Used Product For: Unspecified
Comments
Wrong again - Barcode For Mac
The Addon for ISBN codes (ISBN 10 and ISBN 13) is a separate satellite barcode, not simply a matter of adding "a couple extra digits". It's required for ISBN barcodes to encode pricing, currency etc.The UPC-A freeware generator you mention creates yet another barcode type.
We have an extensive know how and FAQ section on our website (http://www.pro-barcode.com/knowhow.html); perhaps you want to refresh your knowledge about the various types of barcodes before comparing apples and orange.
Wolf Software
http://www.pro-barcode.com
Monday, September 11 2006 @ 09:10 AM PDT
Wow, I'm convinced! - Stormchild
Now there's a solid set of reasons to pay $80. You don't have to add a couple extra digits manually. And wow, it outputs in CMYK. Outstanding! That'll save you the 10 seconds it would take to change the color mode yourself. By the way, you don't "typeset" barcodes. "Typesetting" means "setting type".Here's another freeware option, updated more recently.
Ray's UPC A Creator
To be fair, many of the other barcode programs cost twice as much, which is an even bigger rip off. But that doesn't change the fact that this particular program costs a LOT more than it should. This is a one-trick pony, guys; it's worth maybe $20 at the very most.
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Tuesday, September 05 2006 @ 12:33 PM PDT