I haven't found free ones unless you can find some older ones possibly. One of the NOAA charts does cover the area, but it is so large that detail is not there.
The best thing I've found is the 3 chart set from NV-Charts that is $150 for the set.
Here is a post by me....
NV-charts file extension...
... that also has some info about those charts. I don't think the $150 is unreasonable and we will get those so that we can continue with OpenCPN
and not have to switch to another product that would still require purchasing
Hopefully for both of us there is another option, but so far I haven't seen it,