One good thing about Canon and Nikon is they have been around long enough for a complete set of knock-offs to appear.
With Fuji and Sony you are a bit stuck. I found this "original" hood for $199 ! I don't understand what's going on with that price: https://www.aliexpress.com/item/1005001668003935.html
You can still get screw in rubber hoods that telescope out and fold back quite small. That may be your best bet.