Agreed. Simply two of the same model would be sufficient, as I'm going to be refurbishing them anyway.
If by "refurbish" you mean strip 'em down and use modern parts, I think you would be better off making your own. It's not too hard with a little basic DIY skills. Otherwise your going to be paying a lot of money for something you are essentially about to break...
(epoxy fibre glass resin, a pair of ladies Nylon tights, Bondo and a wire / chicken wire frame mould... Papier-mâché was also a common material to use.)
On the otherhand if you are restoring them to working condition for an antique or modern device, then you would be better off asking around some of the various radio collecting forums - items often trade hands there. Also radio-ham events would be a likely source.