Rich,
You can pick up one of those from ebay for around $175, plus shipping. I have one, and it's the best octave pedal I've ever owned. It actually does exactly what it says, and if you play a chord on your bass, it does not fall apart, like it would on others I've tried that have claimed the same thing. I don't think you're going to find a used one, but check ebay, that's probably the best place to find one for a reasonable price and get it quickly.
Peace;)
Frank