Uncle Mike's made some. I put a set on a 459 for a friend of mine (they made them for fullsize and compact) and they felt great.
CDNN used to have them, but they only have 459 size now. Ebay has some. Probably am not allowed to link, but search for "S&W 469 custom grade grips" will show a pair.
They have not been built in years so they are usually hard to find. I have two pair for the 5906 size that I'll never sell. Sadly they never made grips for the 6900 and 3900 3rd gen guns.