I'll be putting a Nakayama Asagi stone on eBay. It's the middle stone from this
thread. It'll be a 3-day listing starting tonight.
Here is the eBay link.
For the sake of full disclosure, the stone cost me $65 USD shipped from Japan. I spoke to So and the previous owner about it and they said there's a very good chance it is very valuable. However, So couldn't be sure without actually using it and the previous owner was unaware of current prices to give a monetary value. I'd like to get some other shaving related stuff so I'm selling the stone on eBay to get the most back for it.