with parts like electronic ignition switch - you cannot buy a part from Bilal Gunj as it wont work. The virgin part needs to come from the manufacturer. Nearly all parts are replaced nowadays and that "ACTION" is called car repair.
junk assemblies like doors, subframes, handles, wiring etc can be used a bit - but forget about security or CAN BUS parts. Once you see an estimate for the parts - you will have a heart attack.
You will probably have to swallow a full strip of panadol if you want to know the prices of "NEW GENUINE TOYOTA PARTS" of a Toyota Prius Brake master cylinder module or the A/C compressor.
Point being - that the people who buy these japanese orphan cars either have some black money to wash or are "new money"