If you want to see on ebay "discount" pricing, then please look at our PrestaBay 2.5 version.
The field that allows sending discount for a product located under Selling Profile -> Price tab.


On ebay this feature named Strike-Through Pricing.

Not all user can use it. You should be qualified to use this function.

This feature is available to qualified sellers who participate in the Discount Pricing program. Once qualified, sellers can apply Discount Pricing to both MSKU and Non-MSKU items. STP is available on the US, UK, DE, FR, IT, ES sites while MAP is available only on the US site. This program requires every merchant to go through the vetting process, and We cannot enable the STP and MAP to customers without going through the process. However, for this particular issue, it would be best for you to contact our end user customer support team who have the appropriate tools and access to help you.

Please visit : http://contact.ebay.com/ws/eBayISAPI.dll?ContactCS