My Car is Making a Moaning Sound! on 2000 Chevrolet Malibu

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I don't drive my car much so problems can start from lack of use. A few weeks ago my car started to make sounds that can best be described as moaning; it sounds a lot like a walrus. At first it only occurred at low speeds (10mph or less). The noise seems to occur more often when turning. As I've driven it more I have heard the noise a little bit at higher speeds, but usually only when turning, like an a highway off ramp.
Believe it or not when I took it to a mechanic it wouldn't make the noise at all! It rarely occurs at all when driving straight at 30mph+. In addition, the noise usually stops if I apply the brakes.

It's unlike any noise I've ever heard before. No squeaking, screeching, rumbling, knocking, grinding etc., nor does it seem to interfere with the vehicles performance. I can't tell if it's coming from the front or back, or even left or right side. But it is LOUD, and I'm worried it will leave me stranded on the side of the road if I don't take care of it. The problem is I have no idea what it is!

Lastly, and this is only a guess, but as LOUD as the noise is, I get the feeling people outside the vehicle don't hear it as much as I do inside.

ANY thoughts or ideas from anyone would be greatly appreciated. If anyone does know what it is, I'd also be grateful if you could tell me how much I SHOULD pay to have it fixed so I'm not taken.

Thanks so much!
(1) Answer
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Maybe a wheel bearing which is the complete hub assembly that can cost as much as $245.00 installed. But try to have it check and make the sure the mechanic assures you that the problem will be solved when finished.

Let me know if this helps.