I recommend the Lenovo Thinkpad Tablet 2 Bluetooth keyboard EBK-209A. Has a slot in the top to put your eReader/Tablet in. Have used with previous Onyx devices, other tablets, and my current Note2. Works a charm, great Lenovo keys and you even have a mouse pointer to play with. No missed keystrokes or any issues. Lots of ex corporate devices knocking around on eBay for about $20 for a perfect one, I think they stopped making them some time ago but widely available.
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