Maps with LOS: free or paid

I'm switching to FGU, and finding Line of Sight is great, but having to implement it isn't. Any tips for maps or even map packs with LOS? I don't mind paying for them, creating maps is a lot of work. I won't be the first to ask this, so a link to an earlier thread is welcome too.
The Dungeon Master Guide has a good maps with LOS. But they tend to be either huge, or very small. Reddit has quite a few maps for downloading, but I haven't found any with LOS yet. Might be my Google foo, enlightenment is welcome ;).

Unless they come from the FG store, maps will not have LoS information in place already. For products on the FG store, there is a (LOS) icon next to products that have LoS information.

I have heard rumors on the forums of third party mapmaking tools that have added or may be considering adding support for FG LoS; but I don't keep up with those. Perhaps other users have more information on that topic.

Regards,
JPG