give it a try to this one, Wireless Solar Keyboard K750 for Mac, I read some very positive review on Ilounge and 9to5mac few month ago.
Too bad Apple doesn't sell a wireless version of their full sized keyboard. Again, it's form over function.
The fact that the full size apple keyboard has a wire means that they prioritized form over function? I don't see how that applies here.
Who wants a wired keyboard in 2013 ?
Obviously they want their customers to purchase the smaller, less-functional wireless keyboard. Who wants a wired keyboard in 2013 ?
I just bought the Logitech K811 and I love it.
I use my MB Pro and iPad at the same time, plus it's backlit and has a built in rechargable battery.
http://www.gadgetmac.com/reviews/logitech-bluetooth-easy-switch-k811-keyboard-for-mac-review.html
OK, it's not small and it's over 23 years old, but it works great on my iMac:
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Northgate Omnikey 102