Saw this in-store @ Bunnings Greenacre NSW, all the packs appeared to be keyed alike which is convenient if you have more than 4 windows.
Lockwood brand window locks do not appear to be available on Bunnings website and I don't know if this is available at other stores. The same product is available from Masters for $34
I believe this line may be discontinued soon as Lockwood has bought Whitco and some things will be marketed only in one brand.
Lockwood and Whitco are both brands of ASSA ABLOY.
You definitely need this product if you live in Greenacre!
Meku, the Masters price is $69 (your link).
I've installed 5 of these exact type. 2 of them broke. They worked for a while then the lock mechanism jammed. The only way to open your window is to uninstall the lock. You can fix the lock if you pull it apart.
Whatever you do don't use the one-way security screws. The pack includes regular ones.
(BTW it wasn't an installation problem. Definitely something didn't line up inside the mechanism & one of the springs came loose. Putting the spring back in the correct place fixed the problem.)
Masters price depends on your location, the price I gave was for Chullora - the nearest Masters to Greenacre.
Would be a great deal if it can be confirmed as state or even better, nationwide.