15" LCD monitor - Nothing fancy

Hello!

I have a 15" laptop. I'm looking for some 15" monitor (equal in size to my laptop's screen for sake of convenience) to connect to my laptop through its VGA port and use it as a dual monitor.

I'm not looking for anything fancy. Something that would get me more screen real-estate. That's it.

How much would I have to shell for this 15" monitor.

Any suggestions?

Thanks.