H&R Block (TaxCut) has been available for purchase/download for over a month:
https://smile.amazon.com/gp/product/B07YH24MYL. Don’t know if it is updated, but there haven’t been that many changes as far as I know.
I agree that doing taxes online is a bad idea – nobody can really be trusted with our information, so the fewer computers/organizations have access to it, the better. But I don’t agree that the software is becoming expensive or hard to find. The price ranges have been stable ($15-60, depending on edition and any deals) and availability hasn’t changed.
The truly OFFLINE versions of the software may be harder to get now – you need to either buy a CD directly from the publisher, which may be more expensive, or you need to take extra steps to install it on a disconnected computer. For example, H&R Block doesn’t include the state software, it must be downloaded (i.e., the “license” for the state software may be included with your purchase, but the software itself must be downloaded, and it can only be downloaded and installed by the main H&R application – there’s no public link, and even if you manage to download it, it can’t be installed). I usually install everything on one virtual machine and then copy all the files (and registry keys) to another, disconnected virtual machine.