David Chen's book of illustraions and related thoughts (witten in both in English & Chinese) is not currently available through any standard U.S.distribution channels, but you can order it directly from:
Joanne Chang
P.O. Box 3584
Gaithersburg, MD 20885-3584
240.418.5064
Joanne@wuweitaichi.com
Cost is $15 plus shipping, I'd guess $4 or $5, make the check out to David Chen Memorial Fund.