We purchased our barcode fonts from Azalea at www.azalea.com, and have not encountered any problems with them. Their contact info is as follows:
Azalea Software, Inc.
219 1st Avenue S. Suite 410
Seattle, WA 98104 USA
206-341-9500 phone
206-937-5919 fax
Important: You will need to purchase the Windows version of the fonts regardless of the platform you are using.