Synthesizers.com unfinished Entry System 2006

via this auction

"Back in 2006, Synthesizers.com offered a "pay-as-you-go" Entry System plan: pay upfront they shipped you a 22-space cabinet and a handful of modules, and then for $120/month they'd keep sending you new modules. I got 6 modules in and lost interest, but I held onto the system for 15 years.

Recently I took the time to dust off the modules and re-rack them in a carpeted 19" 5U rack that fits all 6 of the modules and PSU in a more... approachable form factor. It's still very heavy, but much easier to lug around than the original MDF cabinet. This is a complete synth voice, including:
Q104 MIDI interface
Q106 Oscillator with PWM, linear and exponential FM, and simultaneous sine, triangle, saw, ramp, and pulse outputs
Q108 VCA with switchable linear/exponential response and inverted output
Q124 Multiples (passive)
Q109 Envelope Generator with adjustable ADSR segments
Q107 State Variable Filter with 1V/oct and linear FM, CV over resonance, a two-signal mixer, and simultaneous outputs for high-, band-, notch- and low-pass modes
The PSU is also way overpowered, as it was intended to run nearly 4x the modules (22 instead of 8), so it would be possible to build up or down with additional 5U racks. (This one is the Procraft 5U rack at 9" depth from Pro Speaker Parts, which can be had new for $71.50 as of this writing.)

Comes with 8 heavy-duty Synthesizers.com patch cables and and 8 light-weight Hosa patch cables, which is more than enough for this setup. I'm listing this as excellent because it is in great shape for its age. The only thing "wrong" with it is that some of the panel screws are a bit rusty. They're easily replaceable and don't affect the unit at all."