Can someone provide me links to a site which works to downloading HLDS please?

My guild isnt working for world of warcraft and i want to get my site going. So im thinking of making a SourceOP server or a AdminOP server. It wont be 24/7 but it will be something to get us going again.

Im short on time on searching but almost all sites with HLDS is blocked or doesnt work when im at school. And I get almost no time at all at home for looking around.