Apple : Wireless Keyboard (US)

Official

http://www.apple.com/jp/keyboard/

Buy it

http://store.apple.com/jp/product/MC184J/A

http://www.amazon.co.jp/gp/product/B002TOJHA4/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=466449256&pf_rd_s=lpo-top-stripe&pf_rd_t=201&pf_rd_i=B000UWRC72&pf_rd_m=AN1VRQENFRJN5&pf_rd_r=17YBB1C5ZWX9G51W267

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Google

http://www.google.co.jp/search?client=safari&rls=en&q=Apple+Wireless+Keyboard+(US)&ie=UTF-8&oe=UTF-8&redir_esc=&ei=GuShS4idOtGIkAWdlonYCA