Where can I find a RS1b bass driver?

I have a pair of Infinity RS1b's. Last week I heard a crackle in one of the bass towers. Well, the woofer second from the bottom has the voice coil locked up. I've contacted NeviSonics or woofer.com and he said these are hard to get parts for to do a rebuild. So does anybody know who might have a replacement woofer or maybe parting out a set ect.? The version that I have has the concave rubber surrounds.