Anywhere to sell speaker parts??

You might want to go to either Madisound or Part's Express website. Each of them has a user forum where folks sometimes post items for sale. It's a lot less hassle than setting up a bunch of ebay auctions and the users there are pretty hardcore so they buy a lot of stuff. Only thing is that you need to set a price instead of letting an "auction" determine what you get. Also, the folks on these sites know the market and items well and won't generally overpay.

http://madisound.com/cgi-bin/discuss.cgi
http://www.pesupport.com/cgi-bin/config.pl

I've shopped for and bought speaker parts on eBay. There's a fair amount of them that move there. That's where I would sell them were it me.

You may also get some interest here on A'gon, or DIYAudio.com, or Audio Asylum.