Previously posted here for $20 but now $1 cheaper.
HN site says sale ended yesterday but website still lists the above price
Keyboard is detectable, so Surface Pro not required for use.
Finding a full size Bluetooth keyboard with Touchpads is hard and this is bargain.
Description
The Amicroe Leather Folio Cover with Keyboard & Trackpad for Microsoft Surface Pro 3 is a versatile addition to your Surface Pro device (sold separately). Complete with an inbuilt TouchPad and Bluetooth 3.0 keyboard with cover, this leather folio case lends your Surface device a sophisticated look and improved functionality.
Key Features
The Amicroe 3-in-1 case enables various viewing possibilities through its trifold feature.
Equipped with a detachable QWERTY keyboard, the Amicroe tablet case provides easier data input.
This Amicroe Surface Pro 3 case has a soft inner micro fibre lining.
Powered by a 450mAh built-in lithium polymer battery with 3.7 operating voltage and a 5V Micro USB input.
Here is a review from member PB Kevcol from that previous deal
From this Gizmag page it looks like this would work with and fit (but be slightly large) previous surface pros
Goes up to $40 bucks when I add it to cart :(