Trust me, I KNOW it is a meteorite. I have many years of experience looking at lots of these, just don't have any idea of values. I actually found this on a So Cal beach.
It is very heavy for its size. I have a hard time believingit is only worth $20 considering the prices I have seen for meteorites these days at some of the shows I have attended.
Probably one of those things that someone needs to look at in person to make any real determination of value.