19$ !!
I bought one and the guy have great communications adn is 100% rating.
They also offer many different current value for the shunt as well as they also have many usefull parts for EV
http://www.ebay.ca/itm/200739175342?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
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