There are occasional postings about book availability in the Phil Dick news groups alt.books.phil-k-dick and alt.fan.philip-dick, as well as the marketplace news groups rec.arts.books.marketplace and rec.arts.sf.marketplace so you may want to subscribe to these. I have opted out. So far, the only money I have lost in an internet transaction has been with a seller who had listings on rec.arts.books.marketplace. A company called DreamWyrd cashed my check and never sent the book. Caveat emptor.