Its the season of the sequels, with SoA S2 at 20k and Sailor moon, Persona 4 the Golden and Free S2 around the 10k mark. Yama no Susume S2 , Kuroshitsuji S3 and Ilya S2 are also roughly around 4k.
With its 5.4k, Gekkan Shoujo Nozaki-kun is having the best performance out of the new anime series. Speaking of which, it doesn't look that good for the new anime series of the season, since Barakamon comes in 2nd with an estimate of only 3.3k
Aldnoah.Zero only recently went up on amazon, but its having a really good performance. But its too early to tell how long it'll keep rankings like that.