Kincrome waterproof cases...
http://www.justtools.com.au/prod3837.htm 430 x 380 x 154mm
http://www.justtools.com.au/prod5046.htm 515 x 415 x 200mm
There is a strong rumour (via WP) that Bunnings will have these cases on special under the Craftech brand just before Fathers day at $20-$30 off.
I'll be tracking this and will post more as I find out more - feel free to post if you hear anything.