There are a selection of antiquarian astrology books up for auction at Bloomsbury Auctioneers (http://www.bloomsbury-book-auct.com), London on Feb 2nd 2006.

Books include:
Astrologer's Guide, Sergeant (Wm.C.Eldon) 1896
Thomas White's Celestial Intelligencer 1811
Henry Coley's Clavis Astrologiae 1776
Raphael's A Manual of Astrology 1832