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enc28j60
http://www.ebay.com/sch/i.html?_odkw=en28j60&_osacat=0&_from=R40&_trksid=p2045573.m570.l1311.R1.TR3.TRC1&_nkw=enc28j60+module&_sacat=0 http://www.elecfreaks.com/store/enc28j60-mini-ethernet-module-33v5v-p-449.html
http://arduino-info.wikispaces.com/ArduinoPower http://www.thesunrain.com/Amazon/4%20relay%20board/4-ch%20relay%20module.pdf
http://www.myropcb.com/services-capabilities/pcba-services/