Warlord is currently offering 50% off individual sprues:
http://www.warlordgames.com/store/catalogsearch/result/?order=relevance&dir=desc&q=sprue&utm_source=Warlord+Games+Newsletter&utm_campaign=3d37400899-Newsletter_18_October_1310_18_2013&utm_medium=email&utm_term=0_b7e928b4ed-3d37400899-132679641#/page/2
http://www.warlordgames.com/store/catalogsearch/result/?order=relevance&dir=desc&q=sprue&utm_source=Warlord+Games+Newsletter&utm_campaign=3d37400899-Newsletter_18_October_1310_18_2013&utm_medium=email&utm_term=0_b7e928b4ed-3d37400899-132679641#/page/2