Is widely recognized to necessarily mean at no financial Price. Its use is appropriate in promotion or speech and its use is recognized to imply no financial Value. I would only alter the use within a predicament in which clarity and precision ended up truly critical, like within a agreement. https://docs.google.com/document/d/e/2PACX-1vR1aRmbt0UmT4gxVq4IXbfDVfh2KrMfGfIz30gs2kLcIKk8h4EVktV5g2U8cNCzOTBSOZHhUqlkGaRY/pub