This is a free product that is also on special.
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This should show as having a price, special price but then be free.
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Attributes can be added that can optionally be set to free or not free
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The Color Red attribute is priced at $5.00 but marked as a Free Attribute when the Product is Free
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The Size Medium attribute is priced at $1.00 but marked as a Free Attribute when Product is Free