This Module is currently available.
Mode Machines is a highly reputated manufacturer of TB-303 X0xbox clones. Now they launched the TB-303 oscillator as modular gear.
The same module is also released under the Dtronics brand name.
The XOXCILATOR is a VCO on the basic of the TB-303 Oscillators. The module is only 6HP wide (30mm) and 30mm deep. It works with less than 25mA @12 and -12volt.