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The vary in price depending on size, but if your talking the standard 8x3" size you are looking at an arm and a leg and perhaps a testicle.

I have one thats a little over 8x2x.07" and I'm selling...

Thats correct, the Kanji really only tells you which mine it came from. The only way to tell if its quality or not is to actually use it. Same with testing grit and hardness.
As I mentioned in my...

Some people have asked me about saving the stamps in case they want to sell their stone in the future. For that reason I have suggested lapping the bottom. If you aren't going to sell your hone on...