This list is by no means complete, please feel free to suggest more - if it has a downloadable installation medium that already contains a preconfigured LXDE, post it here!
That said, there's many, many distros that offer LXDE as a desktop option during install, or have a LXDE metapackage in their repositories. Most major distros for sure.
- Sparkylinux' MinimalGUI images: https://sparkylinux.org/download/
- LXLE is dedicated to LXDE: https://www.lxle.net/download/
- Trisquel Mini: https://trisquel.info/en/download
- Manjaro community edition LXDE: https://manjaro.org/downloads/community/lxde/
- Exton/ExTix offers a few LXDE images: https://www.exton.se/?page_id=2
- Raspberry Pi OS: https://www.raspberrypi.com/software/
PS: the LXDE wiki used to have a page about Linux distributions, too.