Nikoneko ya is a reputable shop that ships Japanese made blu ray to the US. Reasonable and Made in Japan don't really belong in the same sentence though. When you start adding shipping costs, there really isn't an incentive to buy from them anymore. I look in there from time to time, just to find out who is still selling MIJ disks.
If you look at the individual listings, you will see which disks are made in Japan. Nikoneko ya is one of the very few sites that list country of origin on BD media.
The vast majority of TDK are made in Taiwan these days. Most of the Sony disks are too, though the 6x variety are MIJ. The Panasonic disks used to be exclusively made in Japan, but aren't always designated as such any more at that site.
As you've discovered, the Verbatim (non-LTH) disks are probably the best bet for quality/price combined.