What buying in search results involves — how the deal usually happens, what it is priced by — is the same whatever the subject, so it is written once in the Search guide rather than repeated here.
None of these sellers publishes a rate for an ad spot in search results yet — a gap in what has been read, not evidence that the ad spots are free or unsold.
Sponsored products, in-app display, in-bag sampling and off-platform ads on the Gopuff delivery app
Sponsored product, brand and display ads across Amazon