This Module is currently available.
Single-width version of the Q150 Transistor Ladder Filter
The Q150A Transistor Ladder Filter is a single-wide version of our popular Q150 Filter. Both filters use the same circuitry, and they sound and operate identically. The Q150A has only one attenuated input and ships with reversible frequency control. The frequency control can be changed to an attenuated control by moving the connectors on the pcb.
https://shop.synthesizers.com/products/q150a-transistor-ladder-filter-single-wide
These merchants probably sell this module. Huh?
Synthesizers.com Q150A