There are classic Thinkpad keyboards in the used market: http://www.ebay.com/itm/NEW-Genuine-IBM-Lenovo-ThinkPad-USB-...
With some hardware hacking a USB keyboard can potentially be turned into a bluetooth device: https://lifehacker.com/convert-any-usb-keyboard-to-bluetooth...
I think you are looking for this.
https://www.amazon.com/ThinkPad-Compact-Bluetooth-Keyboard-T...
There are classic Thinkpad keyboards in the used market: http://www.ebay.com/itm/NEW-Genuine-IBM-Lenovo-ThinkPad-USB-...
With some hardware hacking a USB keyboard can potentially be turned into a bluetooth device: https://lifehacker.com/convert-any-usb-keyboard-to-bluetooth...