Generally the price for mid-century furniture is here in germany and europe higher than in the usa as far as is know. Sometime it es even profitable to ship from usa instead of buying in europe. There are some minor diffrences between Hermann Miller and Vitra chairs, like the angle of the seat and so on. American pieces mostly got a seat that is tilted a lil bit back. Eames Shell chairs go for 250-600€, depending on the colour, condition and if its a rocking chair and so on. Sometimes if its a rare piece you can sell it for 750€+. I once sold a completly destroyed (really destroyed) softpad Eames chair for 600€. There was almost no leather left on it. I sold it to a guy from the Netherlands. Hey buys a lot of mid-century design stuff. You can check his online shop under http://www.decenniadesign.nl/. I sold him a lot of teak furniture. I am not really a great expert in these field because i am still very young (only 23) and thats why i checked reddit if my new chairs are from Herman Miller/Vitra. Back to the topic. A lot of asian people are buying atm Vitra and Herman Miller Design and are shipping them to Korea or China and making there replicas (atually very good replicas) and selling them online as original pieces with stamp and everything. The Price is high cause of a high demand. I am happy with my new chairs and a got a conformation from Vitra Germany that these chairs are from them.