home security

Hi,

What are the options available to secure windows? The locks on the windows of my ground floor apartment are good for nothing; window can be pushed open from the outside with a little bit of force. So i am looking for any device or equipment that i can install on the window.

1. Steel bars i know, head they are expensive, any reference where i can find a shop for those?

2. Head about something called magnetic locks for windows, anyone knows if they are available in Doha?

3. Any other ideas that i might not have heard about?

Already searched for this subject but didn't find any relevant threads.

thanks