FAR 8.002 does not clearly define the role of DOD EMALL and GSA Advantage in the priorities for use of government supply sources .
Do we buy the Material from Key Electric or EMALL and GSA Advantage. Which has priority and why.?
The following response is based solely on the question and background information provided. As we do not have all of the facts particular to your contract, program, and situation, we highly recommend you consult your Contracting Officer and Legal Office for guidance.
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When it comes to preference between commercial sources, GSA Advantage, and DOD EMALL, you are correct in that FAR 8.002(a)(1) does not point to their priority or order of precedence. That is because these are not "mandatory" sources (per the FAR).
For discussion on the relation between commercial sources and Federal Supply Schedules (FSS), you need to travel two sections down to FAR 8.004. Here, you'll note that Contracting Officers are encouraged to use FSS, GWACs, MACs, and other instruments intended for use by multiple agencies before considering commercial sources.
DOD EMALL is a repository administered by the Defense Logistics Agency (DLA) where contractors/suppliers can list their items and pricing. You may find both commercial sources and FSS pricing. In such cases, FAR 8.004 still encourages the FSS pricing.
Since "encouraged" does not mean the same thing as "mandatory", it's very important to document whatever choice you make in your price fair and reasonableness determination. Even if you go with the FSS pricing, Class Determination 2014-O0011 still requires such a determination.