Hi all -- I was browsing in the Second Story Books shop in Bethesda today and I saw that they had the two volumes of Ridgley and Tudor's BIrds of South America on sale for $100, which is a considerable discount from the price new. The condition appeared very fine. In case anyone wants to add more weight to their birding book shelf! (We were tempted but already have a copy!) Cheers, Gail Mackiernan