EDIT: I misread the NOT stock speakers. Ignore the following.
I shall be taking some out of my Combo Tour, with upgrades ready to replace them. I think the Tour ones are the same as the C. I might not be quick enough for you, though, and stock speakers on ebay barely sell for more than the postage. That said, I would let my stocks go for postage only so, if you can take a little wait and there are no sensible prices on ebay right now, then I can help.
I am in NW England, if that helps lose even the postage cost.