Korin has promotions every now and then and I checked their website the other day. For anyone else brewing with charcoal during the chill autumn, Korin has a promotion right now offering 25% off of high-grade Binchotan (both the Kiri-Chumaru and Kiri-Komaru). 33lbs. of charcoal for $74.25.
I ordered a case of the Kiri-Chumaru, as my last case is getting to the bottom, from New York and it usually takes a little over a week by UPS ground to get here to California.
Nice two part presentation on Japanese charcoal:
Cutting this style of charcoal: