Looking for revel b15a - do i wait for new revel

I presently have F32 fronts, C32 center and S32 rears. I'm running it with the high end denon receiver. Seems to sound fine but really want to add subwoofer - I really want the b15a sub but they seem hard to find. Do I wait for the new revel sub instead of the b15a? I really think that I would be more than happy with the b15a and would rather buy it used to save the money than buying new. Any thoughts or opinions? Does anyone have any ideas of a source where I could locate one?

Your feedback would be appreciated. Tks!