I have two remanufactured axle assemblies from CVJ, the go-to guys for Mercedes rebuilt axles, that I got as a part of a spare parts deal. They are new in the box and ready for installation.
Mercedes Benz Parts - CVJ Axles: CV Axles & Steering Racks for all your needs
One is for a first generation W126 - part number A74310
The other is for a second generation W126 - part number A67110
If you're interested in either, please contact CVJ and verify fitment, as there are variances in the model years and parts - I know the second gen axle does not fit a 350SDL, for example, but it does fit a 300SEL.
I'll sell them for $150/each, shipped anywhere in the CONUS. This is a savings of over $100 as CVJ requires a core charge and shipping (both ways.)