recommend you a post discussing about this problem

by matmiller - 1/22/13 6:05 PM

In Reply to: Postal Bar Coding Software by mikeobicar

I do not know why it can not submit. Ok, fine, I will try the last time.
Here is a post talked about your issue
http://answers.microsoft.com/en-us/office/forum/office_2010-word/how-can-i-include-the-postal-barcode-on-envelopes/c2573c8b-d44b-4a15-ab0c-a6f94bfdc0c1
And I compare several licensed websites that I googled out, this one seems the cheapest
http://www.barcodelib.com/word_barcode/main.html
Hope it will offer some help.