One way to see which pulley it is is to spray WD40 (or similar) on the bearing. When the squeak stops, you found the problem.

 

Ah, I hope I can get it that cheap. 200 was way too much.

Where can I find these pulleys to buy them?

 

I have this same problem.

I was advised to use white grease mixed with a synthetic lubricant. It gets rid of the noise right away but the problem is the bearings are wearing because the serpentine belt is too tight. I guess that can happen on its own?

I haven't taken mine in to a mechanic to get iti fixed yet. I just got the problem diagnosed.

Oh and I also read some stupid advise to rub a bar of soap on the belt to get rid of the noise. I guess that does work but is very bad for the belt and engine so I was told to never do that. In case anyone googles the problem and sees the same answer I did.

 

Hey guys I get this vey same problem of a squeeking sound usually on startup and then it goes away ten seconds later, sometimes it squeeks goes quiet then squeeks again, very soft sound I've tried the hose trick(vacuum hose actually ) but the few times I've tried either the sound wasn't present or dissapeared by the time I got to my car. Very inconsistent problem surely it's a bearing problem?

 

It can just be a little belt slip when cold.