Some of us are still buying the 2018 iPad Pros from the Apple Refurb Store. There wasn't a huge difference in the 2020 models. The refurb store has been low in stock lately for iPad Pros, but for good savings, it's worth checking there now and then.
For the new ones, Best Buy has some configs in stock and others for shipping faster than Apple's. For example, you can get an 11" wifi 256 on 8/21 from BB versus 9/15-22 from Apple.