Electro-Harmonix Enigma QBalls Envelope Filter for sale here. In great shape, works perfectly. Box and manual included - no velcro. Going through filters like toilet paper, and this is one I had to try. Definitely has an insane range of sounds, and I found it pretty intuitive to dial in after a half hour or so of playing. Distortion on this thing is killer. Just decided to stick with my current filter... Price lowered to $110 - includes CONUS shipping. PayPal only.
It can get damn close, especially with the distortion circuit engaged. The unique part of the bassballs is simultaneous up/down filters, but you can dial in a similar throaty, vocal wah with distortion on the enigma. I paired it with some light phasing and got a pretty spot on bassballs tone. To be honest, the versatility/control and wetness of this thing is unmatched.
Someone buy this so I can get it out of my house. My other filters are getting pissed that it's still around...