I have bought blank HAA keys and had them cut at a local locksmith for about $30 ea.
I put the transponder from the original key in the car rather than the key. It has to be very close to the pick-up coil round the ignition switch.
DIY: Making cheap spare keys
Parting a car can be a lot of work, but personally, I enjoy it. Either way, the money may work out about the same and if you are not 'saving' that car you are keeping others on the road with its parts.
So, my advice: Don't stress about it either way, do what seems best to
you.