PeterB (Boer) has been buying whole batches of them. Single coil Chi-Sonics, humbucker Chi-Sonics, J-Sonics. All from Hanson. He is on holiday now, but when he return he can most certainly answer your questions Carlo.
That's right. I've bougth several batches direktly from (Bo) Hanson. I started with the first batch early this year, when I ordered 9 sets. Enough to got a far better price. Bo agreed to this price for all my future orders, so if you need some....
I just love ChiSonics, they look great, have a beautiful old-skool growly midrange, big lows and just enought highs. My Jazz with ChiSonics has turned out to be my most expressive bass. Played soft, it can be very subtile, and when you dig in firmly, it becomes a monster.