Due to the chip issues Sony dropped the A6400 and have now brought it back, unusual, but in the meantime Nauticam dropped the NA6400 housing. And the A6500 housing. So, if you want new, then move to the A6600 or one of the others. Why pay the premium for a Nautican, well, quality, function, rebuild-ability and support. The cameras are almost as easy, maybe easier, to operate in the housing than in the hand. But, that costs money $$.
