Bought the Logitech MK260 Wireless Combo (Keyboard & Mouse) from Challenger for S$39 (member’s price is S$36.90). It is one of the cheapest branded wireless keyboard and mouse combo that I can find in Challenger. The other option is Wireless Desktop 800 which is retailing for S$39 (member’s price is S$37).
Some notable features of the Logitech MK260 includes use of 128-bit AES encryption for encrypting data transfer between the keyboard and receiver, spill-resistant keyboard and battery life that can go up to 24 months for the keyboard and five months for the mouse.