Got a trial of some sort for Prime several years ago, haven’t looked back.
Prime may be great if you shop a lot of Amazon. I shop Amazon less often, my circumstances currently requiring frugality. Often the things I want are covered under a “buy $XX worth, get free shipping” plan which often, if not always, turns out the most overall economical method. And then although they said it was going to be a week, the items commonly show up in two or three days anyhow.