Fullmetal Alchemist volume 1 scored number 1 in the Top 50 BestSelling Manga, and 52 in Best Selling Tradepaperbacks (manga and comics). Volume three of the manga was number 17 on the Best Selling Manga list.
For a complete listing of the best selling mangas, comics and trade paperbacks, click here. (For those wondering who teh best selling trade paperback was, it was volume one of Frank Miller's Sin City. And rightly so.)