It also depends alot on what date you try to go to. CDL is always superhard to get cheap tickets for. Like CDL09-10 I went by the shops 1 hours before the concert would start and the ticket (30th, stand, 1st floor) still went for like 40'000 yen... They did not want to push down the price and I have talked them into giving me cheap tickets before so.
Also, to get cheap tickets is kind of a game. I was planing to attent to a Namie concert and saw loads of tickets all week long and the day of the concert I went down and suddenly they all was sold out. So it's sometimes a bit risky.
Tickets will be there, you can choose your seats, but it will be pricey. If you don't want to try your luck and buy a cheap ticket right before the show starts will say.