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Honestly, and I hope that I'm wrong, I don't think anybody really knows. I've been floating around here for probably 16-24 months and I can't remember them ever being available and I've been told that they're coming back but I'm not confident they'll ever be back. I've been wanting to implant for a long time and recently I just decided to go with the Haworth magnet.
I'm not suggesting you do the same, but they are on sale right now.