One important little note about our newly-licensed 《古汉语大词典》, since I know some people have been trying unsuccessfully to hunt down the printed version; it's also published (same contents, different cover) as the《古代汉语大词典》(ISBN 7532621859), still from 上海辞书出版社, and it's got the same blue-and-white cover design as a lot of other books from them; on my recent China trip I couldn't find 《古汉语大词典》 in any bookstores, but 《古代汉语大词典》does seem to be available at least in larger ones like Wangfujing Bookstore / Shanghai Book City / Commercial Press / etc. Outside of Greater China your best bet for getting it would probably be to mail-order one from Dangdang or another big Chinese book website.