osCommerce Weight Base Shipping
If someone want the shipping should be applied on the products attribute then he should go with osCommerce contribution. The osCommerce weight-based shipping module uses the simple formula to calculate the shipping which is
1:2.5 == shipping cost is $2.50 per kilogram
in weight based shipping, shipping applied as per the product weight if product weight is zero then shipping is also zero i.e. free shipping. If product has no weight and attribute have weight then no charges will be applied on that attribute weight.
Product weight = Product actual weight + Product attribute weight
It will then apply the shipping charges on that recalculated weight.
Recommended osCommerce contribution: http: //addons.oscommerce.com/info/1622