I'm not sure about the rest, but the 20-series Prius uses a 4D67 immobiliser chip, which is just a piece of carbon.
Keys are one of the greatest rorts of the automotive industry.
I'm in Australia, and secondhand Prius parts here are scarce.
So, I bought a few secondhand Prius key fobs on eBay US and had them sent to Australia.
It turns out that although they use the same immobiliser chip, they use a different frequency for the remote locking. The US uses 315MHz and the rest of the world uses 434MHz.
So, if you only have one key and you're in the US then at least get on eBay and buy a secondhand key fob. Then buy a replacement key blade and get that cut.
After I realised that the US Prius keys are different to the rest of the world I started looking at other options.
I went to
www.aliexpress and bought some 4D67 chips for $A4 each. I then bought some Prius key fob cases for $A7 each.
For $A11 I put together some keys that could at least start a Prius.
They didn't have the circuit board inside that is used for the remote locking, but the key blade can be cut to open the driver's door manually.
This at least creates a spare key fob that will open and run the Prius.
PS: The US and Australian Camry Hybrids appear to use the same key fob, so a US fob should work on an Australian Camry.