Source for Grayhill Encoders

Does anyone know of a good source for Grayhill 63K encoders? All of the places that I have found so far do not stock the item and have long lead times. Also, please share any functionally equivalent alternatives that may be easier to source.

-Mihir Iyer

DigiKey has 63R128 in stock at $52.09 each.
And there’s a PDV in the KoP that has some value…