I wish I could easily send a “Please Consider Using Brave For Your Advertising” notification to online vendors I usually buy from.
Since some are organic food producers, they may not be able to afford the $2.5K monthly fee. If not, perhaps they can join with other smaller vendors for a periodic group ad.
For huge vendors eg. Walmart.com even though I am not always happy with their business model, I would ask them to advertise with Brave For The Greater Good of supporting Brave 
Re: Category Requests: It would be lovely to have categories of Currently Planning To Buy items that I could check to receive timely offers.
Meanwhile, thank you for your work in rewarding Potential Consumers for time and attention used in viewing advertising.