Hello aronake - You will need to contact local Keysight service center - the white version has limited stock
and KS might ask You more details about your instrument before granting permission.
[otherwise some dealer / stockist would buy all remaining stock and just ask what they want].
The situation (local policy) might be different from continent to continent - in Europe You must be a registered
KS customer before they accept & process the order.
An option could be to ask AB Precision in Germany if they can ship You such white front panel - but it might come with extra export charges (EU -> HKK) and some extra margin on top. (
https://www.ab-precision.de/ )
Don't forget to order the red bezel (03458-49331) if Yours need replacement.
I agree - since there is a new wind inside Keysight - cost of spare parts has almost doubled and it becomes hard to deal with them.
I would recommend not to wait too long as these are available until gone (in white colour).
Best regards
ScoobyDoo