Big Commerce Custom field calculation and display

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BC: you want to show much much of product is left given the filter parameters set by buyer, and someone with experience in bigcommerce which I don't have. From brief research I determine that it is possible to include arbitrary javascript onto a page, which I belief is all that you require, at which point it's unlikely that I really need to have experience with bigcommerce. I can use lightweight libraries to make this work (not jquery).

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