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I created 2 attributes: sale (yes/no) and sale_price
I would like to be able to determine whether sale is set to yes, then use the sale_price as the final price of the product, "overriding" the regular price, special price, tier prices, and if possible Catalog Price rules too.
Is this possible?
As far as I know the price used for all further calculations in the cart etc is getFinalPrice in the Mage_Catalog_Model_Product class. So my best guess is modifying that method. If that also overwrites the catalog price rules I don't know to be honest.
But I guess this will take some trial and error to check if everything is overwritten and it will also depend a lot on your theme. Some bought themes use getSpecialPrice for comparing the origional price vs any special price.
