This plugin seems to do well with showing the final price of a product based on selections made by the customer; however, there are a number of other conditions/factors that could be updated in the "heaviest" product. Ie. A product that is priced-by-attributes, that has a sale and a special... In such a condition, selecting an attribute option technically modifies the base price of the product as well as the final price to be paid. This plugin currently only updates the final price and not the base price or any of the prices in between. (ie. The sale price overriding the special price.)
This plugin seems to do well with showing the final price of a product based on selections made by the customer; however, there are a number of other conditions/factors that could be updated in the "heaviest" product. Ie. A product that is priced-by-attributes, that has a sale and a special... In such a condition, selecting an attribute option technically modifies the base price of the product as well as the final price to be paid. This plugin currently only updates the final price and not the base price or any of the prices in between. (ie. The sale price overriding the special price.)
There has been a request in the ZC forum thread: https://www.zen-cart.com/showthread.php?70577-Dynamic-Price-Updater&p=1333194#post1333194 And the few posts that followed.