In case you're not aware, and you don't mind buying new, Ebbtide in Australia has a few Jack Fins left of various sizes and both sinking/floating.  They usually get a big shipment every now and then - given Covid's impact on global shipping it's probably not that easy to get stock from Italy at the moment.

Rivers to ranges Rangiora in CHCH stock jack finn they just had a load in i grabbed 3 not sure how many are left but worth trying them. if they are out of them id highly reccomend the WEST lures or NACL, NACL are hand made in welly and its my most hit lure to date!