This games sold pretty well outside Japan, it's currently at 690,000.
http://www.examiner.com/examiner/x-6894-Video-Game-News-Examiner~y2010m7d29-Lost-Planet-2-Super-Street-Fighter--and-Monster-Hunter-Tri-sales-results
http://translate.googleusercontent.com/translate_c?hl=en&sl=th&tl=en&u=http://pornoak.exteen.com/20100731/capcom-revealed-monster-hunter-tri-game-sales-outside-japan&rurl=translate.google.co.uk&usg=ALkJrhh9cZ-3TKb1OcXYUVtd3eRtPQm2YQ
If you can't read it use Google translate. The second link also says it's already outsold Freedom Unit which only sold 390,000 outside Japan. If you combine Tri's sales together with the Japanese ones it'll be on something like 1,700,000.