-But, where to get it?
It's cheap and easy:
Open an 'electric motor'
Step 1: If you have open the motor...
Unwind the coils and you have the wire!
Step 2: But now?
You can use sandpaper, burn it away or melt it down by soldering.
Melting is my favorite.
Step 3: The finish wire
Have fun with your wire! Good working!