I had this problem too. I worked it around linking the price with the weight . At the shipping tab, at the user-defined methods tab, I created two options: One option charging a shipping price below certain weight, and another one with zero value above that weight. later, I input the weight of each product with same value of the price at the product list settings. Later, I edited for the weight not be shown at the store page, since those values are false ones. If you dont need weight for other shipping settings, It can work well.
Last edited by Andre Chilano; 03-02-2011 at 12:45 PM.