Sorry for the delayed response @David Covin, though I hope anyone would feel free to chime in. All three issues, Selling Books Online, In Bookstores, and Hand Sales are really the same issue.
Independent booksellers have been selling books on the web almost as soon as it became possible--even before Amazon. Of course we have always run our own stores and have sold books any way they could be sold, from street corners to salons.
The real question is can we get more reades to buy more of their books from Black-owned independent online and Brick and Mortar stores instead of from Amazon? Someone on Youtube (a "Booktuber") has kicked of an year long effort, for 2018, called the #blackout. Basically the idea is to only read Black literature for a year and to buy those books from Black-owned stores (assuming the book is not borrowed from a friend or the library).
Maybe a proactive campaign to exclusively the read our literature and patronize our booksellers rather than boycotting Amazon is the way to approach this. If we focus on what we need to do to satisfy the three points you raised an active boycott would be unnecessary because we'd be doing our own thing independent of Amazon.
@Mel Hopkins, this actually brings to mind the "follow the reader" idea, what do you think?
Just an FYI,. Dr. David Covin is an AALBC.com bestselling author who has written several books. He has also published award winning authors with his publishing company, Blue NIle Press, and is the founder of the Sacramento Black Book Festival. He is also one of the reasons AALBC.com has lasted 20 years.