Amazon has the Arteck HB030B Universal Slim Portable Wireless Bluetooth 3.0 7-Colors Backlit Keyboard with Built in Rechargeable Battery in Black
Select the Arteck 20% off promo to make total price $15.99 (code MZNNPNB5)
This is the #1 Bestseller in Amazon Tablet Keyboards with excellent reviews.
7 Unique Backlight Color: 7 Elegant LED backlight with 2 brightness level and auto sleep feature to maximize power usage.
Broad Compatibility: Use with all four major operating systems supporting Bluetooth (iOS, Android, Mac OS and Windows), including iPad 1, 2, Air, Air 2 / iPad mini 4, 3, 2, 1, Retina / iPhone / Android Tablets like Samsung Galaxy Tab, Google Nexus / Windows, etc.
6-Month Battery Life: Rechargeable lithium battery with an industry-high capacity lasts for 6 months between charges (based on 2 hours non-stop use per day and backlit off)
Ultra Thin and Light: Compact size (9.3 X 5.3 X 0.24in) and light weight (0.37lb)
As always Free shipping if added to an order over $25 or with Prime