Until close of business on Tuesday, June 28th (that's tomorrow at the time of posting), Subterranean Press are (is?) running a half-off sale on preorders including The Authentic William James.
The Subterranean edition is limited to 1,000 signed and numbered copies at a list price of $40.00. Until the sale ends tomorrow that's cut to $20.00.
Other titles in the sale include China Mieville's This Census-Taker, and Robert Silverberg's Early Days.