For those interested in this topic, please note that Panasonic have recently released ‘Made in Japan’ version of the SL disks in both recordable (1x-6x) and erasable (1x-2x) formats. These products have now made their way onto eBay and Amazon. The release comes some months after older 1x-4x SL 30 spindles were discontinued by the manufacturer and prices skyrocketed. Not as cheap as the older spindles used to be up to 2015, however I expect the quality to remain above the other manufacturers.
LM-BRS25MP30 BD-R now has version 1.3 compared to version 1.2 on the older LM-BRS25LT30. Not sure what differences this makes, if you know please reply.
Some more info: