Hmm, this must be something fairly new. There used to be a link in the drop-down box next to the item to "Revise Invoice", but I think that was removed long ago now.
What do they mean by "eligible"? I thought this referred only to items that were eligible for a seller's automated discounts.
Did you see this "add other eligible items" button on .ca or .com? Where exactly was that button? I'd like to know for future reference, since eBay never tells us about these changes. 
