Spose, I've seen them on e-bay every 3 or 4 months over the last year and a half. I don't remember the winning price or what shape they were in but it seems they were all reported to be in good enough condition. In about a year or so I may be in the market for one for a homebuild project. There's a lot of woodworking left to do before I get to the activators.
Good luck to you finding what you need to upgrade your P bass.
Rich