Your camera can use original SD cards or SDHC cards. It will _not_ be able to use any of the newer SDXC cards.
B&H Photo is one place that still sells SDHC cards. The largest possible capacity of that type of card will be 32 GB.
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Ricky
Camera: EOS R5 II, RF 50mm f/1.2L, RF 135mm f/1.8L
Lighting: Profoto Lights & Modifiers
