How to change price format in OpenCart?

Question

opencart

Hello!
You need to change the format of the price field in OpenCart 1.5.6 so that you can enter not only numerical values ​​but also alphabetic values, for example, you can display "on request" in the price field.

Answer 1

It's better to rewrite the template. So that, for example, if 0 is specified as the price of a product in the admin panel, then another block is displayed instead.

Answer 2

And if you expand the question:
1. And for Opencart 2.*
2. I found solutions on how to add the necessary text in the "Price" field if "0" is entered in the admin panel.
And how can I make it possible to enter not only numbers, but also an alphanumeric expression in the "Price" field in the admin panel, for example, "2B"?