Found this today in Melbourne Central Zing store. Khans of Tarkir, Oath of the Gatewatch, Dragons of Tarkir and fate reforged and I think Magic origins are all 50% off from 7$ and online seems to be almost 4$.
Bought 6 and then went back to get more for a draft with some mates.
Besides buying a box the cheaper single boosters are 5$ so great deal.
Doubt it was just this store if it was online too so hope you get some booster cheap too!
Online URL if anyone else is interested.
https://www.zingpopculture.com.au/any/any?q=magic%20gatherin…
Good find OP.