Why not take advantage of the retip exchange or upgrade programs offered by Musical Surroundings (Benz distributor for North America)? You can either swap out your Ebony for a new one or receive sizeable credit toward a Ruby or LPS.
There were some availability issues with Benz cartridges in the past, but those have been resolved and there's healthy stock in the US.
There were some availability issues with Benz cartridges in the past, but those have been resolved and there's healthy stock in the US.