If you're looking to buy a new one, I would say send him a message on instagram and tell him about being on the list. He isn't a make one knife a month kinda guy. Also, about five years ago he got a new grinder, so his current knives would blow Salty's slicer away.
Up for sale is a 240 kasumi Shigefusa Yanagiba. I'm not a single bevel expert, but seems pretty close to new, a few super minor blemishes, probably from storage. Nice clouds. Feel free to message me with questions. $550 shipped in CONUS.
I'm giving up on trying to get a Shig sujihiki (4 year search), so I'll go for another unlikely candidate. I'm looking for a Hiromoto honyaki suji. I think they only made them in 270, but I'm open to any length. Very rare, but I know they are out there somewhere. Merry Christmas!!!