Google Adwords introduces In Market Buyers (it’s a display product!). Google’s support page about this: In-market buyers (available only to campaigns targeting English): Select from these categories to find customers who are researching products and actively considering buying a service or product like those you offer.These categories are designed for advertisers focused on getting conversions from highly qualified customers. “In-market buyers” categories can help drive remarketing performance and reach consumers close to completing a purchase.

MOAT display banner database

PS: don’t forget this interactive banner database of Spongecell