His BBM rookie card is #426 from the 2001 set. His only other card from 2001 is from a company called Broccoli who put out several sets for the Lions from 1999-2001, mostly I think to capitalize on the popularity of Daisuke Matsuzaka. For the next two years, the only card of him that exists is from the 2003 BBM Seibu Lions team set. Starting in 2004, however, he became a regular in each of the BBM 1st and 2nd Version sets. 2004 was also the first year he appeared in a Calbee set.
Nakajima has appeared in two Nippon Series with the Lions - 2004 and 2008 - and therefore appears in the corresponding BBM Nippon Series sets. He won a "Outstanding Player" award in the 2008 Series so he has two cards in that set. He has made the All Star team eight of the nine years he's been a regular, missing only in 2005, so he appears in the corresponding BBM All Star sets. He played for the Japanese National Team in both the 2008 Olympics and the 2009 World Baseball Classic so he has a card in the 2008 BBM Team Japan set as well as a couple cards in the various WBC sets from Topps.
As always, this is not a comprehensive list, just some of the highlights. Check SportsCardForum's Inverntory Manager for a much more complete list.
Here's some example cards:
|2001 BBM #426|
|2004 BBM Pacific League Playoffs #P25|
|2005 Calbee #001|
|2006 BBM 1st Version #88|
|2007 BBM All Stars #A22|
|2008 BBM Nippon Series #S60 (Outstanding Player Award)|
|2009 Topps Chrome WBC Inserts #W62|
|2010 BBM 1st Version Cross Stream #CS138|
|2011 BBM Lions Classic #16|
|2012 BBM 1st Version Best 9 subset #363|