alternator for e36 1992 318i

Firstly, it all begin with the battery light randomly coming on. This all lasted for about a week. Strangely, 2 days ago NO battery light
came on when i turned the ignition half way when the radio etc is on, but the engine if off. Just yesterday, as i was driving the ABS light started flickering, the little icon thats orange with an exclamation mark came on. Lukely i was just about 400 meters away from home when the car started loosing power and i struggled to maintain speed. Next you have it, i reach home turn off the engine, tried to turn it on again; no go it just clicks, hazard lights come on for a few seconds, no go.
I had road side assist come to my home and check it out and he confirmed that it was the alternator. So my question is how much am i looking at roughly for a new alternator (not from the dealer?)
With a simple search i get various quotes, the cheapest being $180 or so, to about $1000
$200+ here: 92&productô000-36213&application0418891&part=Alternator&dp=true
$400+ here:
which one is it?
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