Damn, I've been searching for that for a while. It used to be linked from the order history page and isn't anymore. I thought they had removed that feature. It is a bit annoying that I can get a CSV from my bank in under a second, but it takes a few minutes to get an order report for a similar date range from amazon.
They did fully remove it about a year ago. At the time, the official support response was to point people at the GDPR export. Based on my email from when I requested a GDPR style export, that was around 2020-09-15.
It was just in the past week or so that I noticed that it's back.
It's on your main account page under "Download order reports"
