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Multiply that effort by three , four or five key vendors , and you have a major dilemma on your hands . The ether stacks are purchasable from separate vendors , and the two stack vendors are again very similar in capabilities , footprints , and costs . The program will interest collection development , acquisitions , serials , and interlibrary loan librarians , reference and other public service librarians , subscription vendors , and publishers . Many companies have consolidated their supplier networks in recent years to a handful of key vendors , Thomas noted , which gives them a significant opportunity to negotiate favorable prices and payment terms . In the absence of tangible solutions from ILS vendors , NCSU Libraries consulted with various players in the industry and determined that Endeca was uniquely qualified to meet the needs of the Libraries and its patrons . The use of other third parties , such as independent living centers , public buses , or DME vendors , also has helped address transportation problems .