In Wichita...Jacob Liquor Exchange. They only have the Japanese Harmony so you won't find the 12 or 15 year old but it's still damn good. I believe it was about $70 which isn't much different than what I paid in Tokyo.
In the link below (if it works) look just left of center at the photo, second shelf from the bottom. When I saw it I was shocked but they said they typically have it in stock.
https://www.google.com/maps/uv?hl=en...uYR6XdZjQgCLIB
Last trip my tokyo co-workers and I had dinner at the Hibiki restaurant right by Shinagawa station. I had some of the 21 year old. Tasty.