Yes, it’s nice to have blogs integrated into your site architecture. But if you’re low on budget and still want to launch a blog (or many), the cheapest, easiest option is to do what American magazine VegNews did and create blogs on one of the excellent free platforms out there (for instance, they use Blogger; I use WordPress) then just link to them from your home page.
Their three blogs (Café VegNews, Press Pass and This Just In!) are featured in a block on the home page (pictured above) but link out to their own Blogger pages. It’s really a great idea: not only is it an easy and cheap way to add blogs to your site, it’s a low-investment way to experiment with blogs, decide what topics work for your audience and find out how well the blogs perform.