Not a direct fix, but more of a method. If know where the desired functionality is provided, then might be able to pull equivalent code to place as desired. So would look at the template, module, and function files associated with the final page and duplicate the actions on the first. There are some functions that will return the price you are looking for. While the most recent version of ZC isn't specifically identified, towards the bottom of
http://www.zen-cart.com/docs is a link to code explanations to obtain/find the function(s) providing the result(s) you are looking for.
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