Are there more of these out there to be had? I'll buy a case at a time.

 

Doesn't look likely:

Lexus Part Number: 90915-20004
FILTER, OIL This genuine part is manufactured and warranty covered by Lexus.
Manufacturer's Notes:
Replaced By:90915-YZZD3

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They were replaced a long time ago but I got some from Carson Toyota a few months back. Now they are all gone. I believe there are a few still out here in the USA. A moderator on iH8mud was buying them by the pallet from Japan. To my knowledge, they are still made and used in Japan.

 

they are on ebay but expensive

 

I don't see them. Did you mean just to keep a watch out for them as they sporadically appear from time to time?