Ingram announced this morning the names of e-book retailers that have joined its CoreSource Plus network over the past six months: Bilbary, Copia, Books-A-Million, iPublishCentral, Fishpond, BookShout!, Flikkt, Page Foundry, Baker & Taylor, and Ingram's e-textbook platform VitalSource Bookshelf have all signed on. All new retail channels are expected to be live by the end of 2012.