The tool brings a huge problem. You need to buy one to know it is fake, thus making the counterfeiter efforts successful.

Bad product reviews on the sales site won't work as they can be easily circumvented if not removed.

Bad product reviews on 3rd party web site won't be effective as well.

I think the right tool is a website to show updated buck/TB prices. So we can avoid buying fake devices. The proem is how/who would keep those data up to date. And how to make that site a popular choice for buyers.