Reddit reviews IVSO Surface pro 3 case Ultra-Thin Bluetooth Keyboard Portfolio Case - Aluminium Bluetooth Keyboard Stand Case / Cover for Surface 3 pro Tablet (Gold)
We found 3 Reddit comments about IVSO Surface pro 3 case Ultra-Thin Bluetooth Keyboard Portfolio Case - Aluminium Bluetooth Keyboard Stand Case / Cover for Surface 3 pro Tablet (Gold). Here are the top ones, ranked by their Reddit score.
Any bluetooth keyboard will work. There are some cases that have a keyboard built in too. I only have links to US amazon, sorry.
http://www.amazon.com/dp/B00K4C73OU
http://www.amazon.com/dp/B00C8T7NOW
From my small amount of searching, any bluetooth keyboard works just fine with the surface. That being said, only Microsoft is making a "good" (or any, really) pure keyboard attachment for the Surface. It seems like you'll have to go with a case + built-in keyboard solution. Something like this, for example.
http://www.amazon.com/IVSO-Bluetooth-Keyboard-Portfolio-Microsoft/dp/B00K4C73OU