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When I visit http://www.outdoorfurnitureoutlet.com.au I am 301 redirected to http://ofo.com.au. Perhaps there was a server glitch before which is now resolved.

I ran into this situation a few years ago.  We set up inner pages with the modal content anyway and loaded the content via ajax.  For users without javascript it would gracefully degrade.  Who doesn't have javascript right? Well, Google crawlers for one.  The additional pages won't hurt you.  You can craft this so it's a transparent process for the end-user. If you're in a competitive market and you only have the single page it will be extremely difficult to compete with other sites that are pushing new content and consistently expanding their web presence.