Are there additional keynote masters and pages templates available?

Just wondering if there is a website or an apple download for additional keynote masters, and pages templates? The apple supplied masters and templates are really well done...

I also have word and powerpoint on my mac, are there additional templates available for these apps too?

I found this website, but free would be even better!
KeynotePro : Keynote Themes

Thanks in advance...

Not sure how useful, but try iWork Community.