From my wife who isn't setup to be able to post at the moment:
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Walmart's brand Sam's choice Real Semi-Sweet Chocolate Chips are pareve (milk
free) but not all Walmarts have them.
We use Tropical Source semi-sweet chips from the local health food store. You
can see it at
http://www.worldpantry.com/cgi-bin/ncommerce3/ProductDisplay?prmenbr=172832&prrfnbr=457241
They make a point of saying it is "manufactured in one of the only chocolate
factories in the world that has dedicated production equipment that is never
used with dairy or gluten ingredients." They have a line of chocolate bars
too.