I cannot find this part at larger stores, any idea where I could?

Simply won't keep tension anymore. I put the new belt on, adjusted it to where it needed: Sure enough, two weeks later and squealing all the time.

I could potentially do this on my own, but estimates on shop prices? I don't have a lot of free time between jobs.

Thanks.

 

I assume you are talking about the idler bearing for the serpentine. http://www.rockauto.com has that. They also have the hydraulic tensioner for the timing belt and the belt tensioner bearing and idler bearing.

 

All I see are pulleys. The whole mechanism is not working. =/