Hi,
Since version 6.0, you can easily add more discounts to the product, although it still requires some customization.
At first I would recommend you to read the Blogpost by our Ecommerce module tech.leader Petr Vozak about new customization model in version 6:
devnet.kentico.com/Blogs/Petr-Vozak/October-2011/E-commerce-6--New-customization-model.aspxThen, you will be able to add a custom field to the product system table and in the custom provider you could check if the second discounted price is available and use that one instead of the full price during the checkout process.
Rendering the price is a matter of transformations.
You can check the code in the sample providers bundled with the CMS installation, the alternative price example can be seen in
\App_Code\CMSModules\Ecommerce\Samples\CustomSKUInfoProvider.csThere is an override method
GetSKUPriceInternal, your code would be just slightly different.
Should you need any additional details, please feel free to ask.
Regards,
Zdenek C.