I have been looking to buy a case for my iPad 6. Found this logitech and bought it happy so far. Reviews are also good mostly.
RRP is $159.95
Officeworks $111 (was$139)
Mwave $139
Jb hi fi $111.96
The good guys $99
Second hand sells for more than this.
It has cell coin battery and it can last up to 4 years (using 2 hours per day)*
* disclaimer: info from logitech website
Have the version for the iPad Pro 3rd gen and it is really good. Paid 180 for it and am very happy.