HP 71B RAM: has anybody big ones to sell?

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Hello Girls and boys,
I will get my Multimods and was thinking somebody would step in and offer me via privat message any xxxxxxKb RAM for the front ports (this is like tuning: you put a 12cyl engine on a 2CV. it makes sense? not really. But for the fun, if we can do it, we make it). you see the engine outside the engine compartment? (for example the RAM would be outside the HP71B in an arduino or other?), nobody care as long the power go to the wheels. price? the ECB print the money = not an issue.
The HP71B in my possession has 2x32kB + 4kB RAM.
Thanks for all exchanges and people sharing my thoughts (sorry, I can make few programs in python-fortran-pascal-java-c-pygtk-tkinter-java-HP41 but no electronic circuitry).