Archaeopress, the publishers of the SIS Cambridge Conference Proceedings organised by Benny Peiser and featuring Euan MacKie, Duncan Steel, Amos Nur, and others, at just £18 per download (the printed version costs an arm and a leg, and part of the pelvis too) has another interesting download (again, at £18, a reasonable price as a book would fetch much more than that), The Years Without Summer; tracing AD 536 and its aftermath' Joel D Gunn (170 pages with maps, charts and line drawings) – go to www.archaeopress.com
One other title that attracted my attention was 'Romano-British Livestock Complex in Birmingham: excavations 2002-4 and 2006-7' – which probably would not concern many others.