https://www.vanitycollections.com.au/products/vc-xl-palette-holder I saw people recommending this one for JSC palettes somewhere else. It's rather pricey.

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But also, have you considered binder organizers?

https://www.amazon.com/Crystal-Acrylic-Desktop-Sorter-Holder/dp/B019Q1V322/ref=sr_1_16?keywords=clear+desktop+binder+organizer&qid=1575751465&sr=8-16

https://www.amazon.com/Easepres-6-Tier-Desktop-Organizer-Document/dp/B07CCKY3HG/ref=sr_1_6?keywords=clear+desktop+binder+organizer&qid=1575751465&sr=8-6

https://www.amazon.com/SimpleHouseware-Organizer-Sliding-Upright-Sections/dp/B075FGGPXV/ref=sr_1_9?keywords=clear+desktop+binder+organizer&qid=1575751465&sr=8-9