Are you a design-lover who cannot afford the originals of the famous modern classics and that is why is in search for the perfect reproduction chairs? May be you will like some of these:
Hanging bubble chair - This is not the famous Eero Aarnio Bubble Chair, but it is very much like it. 
And here below is another reproduction one of his famous designs:
Ball chair
Ball Chair is a "high-quality redesign of the original while staying true to the original craftsmanship", as the company claims. And the last one, which is one of my favorite designs by Arne jacobsen and for which, again, the seller declares to be 'true to the original':
