I went down to the Tokyo Dome today and as it is, there are still tickets available for a few of the WBC games. You can walk right up to the ticket window and buy them there, every day from 10am to 5pm.
March 5 18:30, Game 1: China vs. Japan: Sold out
March 6 18:30, Game 2: Korea vs. Taiwan: Tickets available
March 7 12:30, Game 3: Losers: Sold Out
March 7 19:00, Game 4: Winners: Sold Out
March 8 18:30, Game 5: Game 3 winner vs. Game 4 loser: Tickets available
March 9 18:30, Game 6: Game 4 winner vs. Game 5 winner: SOME tickets available on the 3rd base side
I was told that if Japan IS in Game 5, they will be on the first base side.
Games 3 and 4 were actually sold together, so basically, even though it's unlikely many people will go to game 3, the game is sold out. Bummer.
S - 10000 yen / A - 7000 yen / B - 5000 yen / OF - 3500 yen / 2F unres - 2000 yen, 1000 for children
S - 16000 yen / A - 12000 yen / B - 6500 yen / C - 4500 yen / OF - 5000 yen
(no unreserved -- B and C are the second floor)
You can also see prices and seat charts here, though it's in Japanese.
I'm really interested to see how Japan and Korea fare against each other this year. After the Olympics and the last WBC, there's got to be some pretty high friction between those teams going on.
On another note, if you want a Chunichi Dragons 2009 team calendar, you can get one at the Tokyo Dome store for 1230 yen. If you want a Doala 2009 calendar, you can get one for 1575 yen. In other words, the Chunichi Dragons are, infact, less marketable than their mascot.