I saw many users selling this module lately. Why is that?!
Couple of reasons.
1) A new smaller, somewhat improved version has recently come out.
2) While its a fun module, there were some issues such as unstable internal clock, general confusion as to how the knobs worked/related to one another.
So, between the draw of something new and shiny coupled with some dissatisfaction has made a lot of people sell it. I've seen them go as low as $150 recently.
Personally, I sold mine because I found a random module that better fit my needs with the SSF URA.
Just watch the richter. I used to have one and the 'freeze' aspect in mine never worked right. Instead of locking in a pattern, it would clear and fall back into an ascending staircase pattern. Ive read others complain about this as well.