Purchase Yokohama Baystars tickets?

Travel Info
I will be visiting Japan in May, and I was wondering if anyone knows a website or telephone number where I can order tickets for a Yokohama Baystars baseball game.

Travel Tips

Here is their schedule: http://japanesebaseball.com/teams/schedu...

The games against the Tigers and Giants may be difficult to get tickets to. For the other games you can just walk up to the ticket window before the game and buy tickets. As you can see from this site: http://home.n00.itscom.net/kbt-t/yakyujo... they only half fill the stadium on average.

If you want to be assured tickets and you're willing to pay extra then you can try these services:
http://www.fdjp.com
http://www.japanball.com/tickets.htm...

If you don't want to pay extra then you can go through Lawson, but I don't know how easy this is to do from the states.
http://www2.lawsonticket.com/
http://www2.lawsonticket.com/pc/p31/2007...