Usually you pay once rather than per item, but that is a setting each store controls rather than a rule of the marketplace. The difference matters when you are about to win your third thing.
The default
Combining is on by default, and the charge for each later win defaults to nothing. So in a typical store, winning three items in one show gets you one parcel and one delivery charge.
What a seller can change
Two things:
- Whether wins combine at all.
- A charge for each later win — the shipping settings call it
Each later win, and a store can put a figure there.
A seller charging something for later items is not overcharging you. Three items means a bigger box, more weight and more volume, and a courier bills the greater of weight and size. Zero for every extra item is generous rather than standard.
Where to check before you bid
The delivery line at checkout, and the listing's own delivery information. A combined order shows as Delivery (combined) on the order summary, which is how you can tell it applied.
If you are planning to win several things, the honest move is to look once at the start of the show rather than discover it at checkout.
What never combines
Items from different stores. Always separate parcels, always separately charged. There is no setting for this and no exception — two sellers cannot put their items in one box.
So "three wins, one delivery charge" applies to three wins from one store.
The case where a second charge is correct
Winning something later, after an earlier order has already been dispatched. Once the first parcel has gone, the second item is a second parcel, and it is charged as one.
If you expect to win more, it is worth telling the seller before they pack. Most will hold the first item for a short while — that is a conversation, not a setting.
Pickup
Collection is usually free, and combining is irrelevant: you are collecting, so the number of parcels is your problem rather than a cost. How pickup works.
If you were charged twice and think you should not have been
Ask the seller from the order. If both items were from the same store and neither had shipped, a seller can refund the difference — and most will, because it is a two-minute fix rather than a dispute.
More: how delivery is charged, when will my order be sent, how to track an order.