Stone Circles (Mysteries of the Ancient World) (1997) - Aubrey Burl £1.99
Recently picked it up in a charity shop for £1.00
Only 40 pages but with lots of colour photos and a brief but interesting overview of the stone circles of Britain and Ireland.
This is a really good book for the general reader who has just started to take an interest in stone circles. Well worth my £1.00 coin!