How many Amphicars are left?

I'm curious, could you please provide me with an estimate of how many Amphicars are still in existence today? I understand that they were a unique blend of automobile and boat, and I'm fascinated by their rarity and versatility. It would be intriguing to know if there are still a significant number of these vehicles out there, or if they've become extremely scarce collector's items. Could you shed some light on this for me?