I ordered the Rappan Athuk Book and PDF bundle. It was supposed to be on sale for $99.99 which minus my 15% would be $84.99. But it showed it was the full price of $114.99 with a price of $97.74 after 15% discount.
The Advantage discount doesn't stack with most sales. You get either the sale price or the Advantage discount, whichever is higher. In this case, 15% is a higher discount than the sale so you get that price.