we used to provide specific percentages, but phased that out over time as it was obvious that wasn't providing real value -- where on amazon.com do you see their markup?

additionally, for virtually all stores on instacart.com now, we are simply passing on the pricing that the retailer has given us (which may or not be marked up from their internal prices -- but we do not control)

edit: to be crystal clear, that means that you are getting exactly what you are asking for -- the prices are simply what the retailer sets (which may be marked up from in-store -- that's their prerogative), and then we show our fees on top of that on checkout. we aren't "hiding" anything, and it's your decision whether the fees are worth your time.