No info about availability.
AM4023 Low Pass Filter
http://synthcube.com/cart/index.php?route=product/product&path=74_65&product_id=144
Included in 9 Racks, 8 are public:
Synthcube KITMISHLVSEGRY16
Synthcube KITSHVLEXPMWHT18
Synthcube Synthasystem QUAD VCO
Synthcube KITNFFZZZEMGPB08
Synthcube PANMIPKSEGRY08
Synthcube PANMIKNKSWMGP04