Emperors Cup tickets

Will be in Tokyo in December, and keen to see either Urawa or Kashiwa Reysol in action.

Can anyone please advise how to obtain tickets?

now checked 92nd Emperors Cup[天皇杯/てんのうはい/ten-nou-hai] official site.
http://www.jfa.or.jp/match/topics/2012/111.html

All games(R4/4回戦 to Final/決勝 4days) tickets sales
from 24(Sat) Nov 10:00am start on Play-guides(contain convini-store machine).
https://www.jfa.or.jp/match/matches/2013/0101tennouhai/ticket.html
[R4] tickets same price 1500(non-reserved) - 4500Y(reserved SS) as Advance tickets

Lawson[ローソン]　"Loppi(L-code)" easiest like this.
http://l-tike.com/guide/loppi_english.html
http://youtu.be/Eu_z2UGEWx4

【77】 L-code : (yet but update soon) http://l-tike.com/sports/emperorscup/
Urawa [浦和レッズ] vs Yokohama F Marinos
at Kumagaya/熊谷 in Saitama PF (guest stadium)
http://www.parks.or.jp/kumagaya/access/index.html

【80】 L-code : 36631
Kashiwa Reysol [柏レイソル] vs Yokogawa-musashino FC(not J1/J2 class)
at Hitachi-Kashiwa/日立柏 (one of home stadium) in Chiba PF
http://www.reysol.co.jp/game/stadium/h-map.php
http://blog.reysol.co.jp/news/2012/014478.html (seat area map)

both stadium have　about 15,000 seats,
non-reserved will be sold out quickly many many core supporters gets.