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I don't have an extra, but last year I had Orange County Speaker recone one of my E's with an aftermarket kit and it sounds as good as my other original cone E120's. They were great to deal with and the price was reasonable. Then you know what you have instead of rollin' the dice on ebay or craigslist.
I've never had an E re-coned... but I gotta think the shipping would be expensive.
If you're on the east cost, check out Dutch at Vin-tone.com. He's been helpful here on the rukind board and I had him re-cone a D120 with after market parts and it is stellar (OEM factory kits are no longer available for any of the jbl 12's we use). I think he is in new jersey.