From Elfring Fonts:
Here's an easy way to print bar codes from Windows! This set contains 14 scalable OpenType bar code font formats: 2/5, 2/5 interleaved, 3/9, OCR-A, OCR-B, PostNet, and UPC-A fonts. You also get VBA functions for Excel and Access, Word label templates, plus our BarMore utility program for creating bar codes. Complete documentation on bar coding is included.