They are still available brand new
Cheapest source are the small tiny cabins/shops selling nuts/bolts and screws in plaza/magazine lane or the shops in center of plaza market selling electrical items.
They are sold at toyota showrooms too.
The reason people install cheap crap is because they see this terminal for Rs 200 and cheaper one for rs 50 but it requires hacking wires etc.
They will choose cheap and hack wires because it doesnt have any effect on “resale” unlike car paint which is supposed to be kept super genuine including bird poop dropped in factory parking lot.