Not sure exactly what happened as I can't find any direct news about it, the big boys may be just fighting it out, or manufacturing may have gotten cheaper, or most likely they finally decided to stop gouging us so hard in this economy.
This weekend saw wholesale prices drop on certain models as much as 40% from Sony, 20% from TDK, and Panasonic has new models out in line with the new prices. The big movers were the one's everyone has been waiting for 50gb BD-R DLs and both 25gb and 50gb BD-REs. 3 packs of Sony 50gb BD-Rs dropped around 1500 yen, about 40% off the price last week, 20 pack Sony BD-REs dropped 2000 yen, about 20%, for example. The TDK moves weren't as drastic as they were already cheaper but they did go down. So we are finally seeing 50gbs under $10 here and BD-REs under $5. Also this now make BD-REs just a little bit more than regulars BD-Rs, and DLs less than double price, where they should be.
Anyway really fun news, and hopefully the new prices will trickle down to you guys outside Japan eventually.