That is a Bergère chair. I don't know where to buy them but you can try Ebay and other sites now that you know what to call it. They are actually very comfortable. If you ever go to France and Belgium, you can still get them at the fleamarkets and used furniture places!

http://en.wikipedia.org/wiki/Berg%C3%A8re

Try worldmarket.com

Thanks!

hickory chair makes one like that - but pricey and I believe available through designers and high end showrooms only

Try Horchow and/or Ballard Designs.

Ethan Allen...check out the Fairfax or the Giselle chair...tons of finish and fabric options.