I’m a day late on this one, my apologies. Given their interest in adventure fantasy and the fiction of the 1930s, I assume Black Gate readers are more inclined to frequent used bookstores than the average book buyer. One of the best resources online I have discovered is ViaLibri, a search engine devoted to used bookstore sites including Amazon and AbeBooks. At its site, one can discover everything from a 1932 copy of Oriental Stories Pulp Magazine, Spring 1932, Volume II, # 2, containing “Lord of Samarcand” by Robert E Howard, to the 2008 limited edition re-release of Howard’s Kull: Exile of Atlantis by Subterranean. Many of the books are a bit pricy, but bargains can occasionally be discovered; I found a complete set of the 8-volume, 1936 edition of the The Cambridge Medieval History in England for about a quarter the price I would have paid at my local used bookstore for a set missing a volume. It was an excellent deal even with the added shipping expense required. Whether you’re a serious collector or simply happen to be searching for a specific book you recall from your youth, ViaLibri is a nice resource that may be of some utility in your hunt.