This is not a bargain, but simply the best available deal (in NSW, at least) for those after free range organic eggs. It was first mentioned here by @Hellfire
Choice Mag's CluckAR app says their chooks enjoy 12sqm each (when free), which is not the most — Gunning Bum Nut chooks @ Harris Farm enjoy whopping 50sqm each for $7.50 a dozen, though not organic) — but are the best at this price point amongst organics.
Note: don't neg the deal simply bc you don't think either free range or organic are worth the additional cost. If that's your case, you are at a different point of the curve (i.e. this simply ain't for you).
Free range eggs are much cheaper at Aldi