Logitech K380S Pebble 2 Combo Wireless Keyboard & Mouse (Blue) and Sand colour models are $79 @JB Hi-Fi - online and in-store. Bought one in-store today. Could possibly price beat at OW for $4 less at $75 or better if you have a GC / Perks Coupon / Birthday Coupon from JB.
Key features
Type: Wireless keyboard with up to 3 years battery life and 2 years for mouse
Compatibility: Use Bluetooth to connect up to 3 devices across operating systems
Design: Personalise 10 Fn keys and mouse middle button with Logi Options+ App
I've got the earlier K380 version of the keyboard…..really portable, had no issues with Bluetooth connectivity (to MAC, Windows and even connecting to a phone), the battery lasts for ages and the keys are good to type with (but not good as a mechanical one obviously).
Only caveat is that there are no LED backlights to type in the dark, which is also why the battery lasts for a while on this keyboard.