Credit to @aussie222 & @ilovefullprice
I don't think boost on ShopBack was ever posted here before
on their website it says 40GB for $15 so i don't know if that's a mistake or not - Paging the ShopBack rep
if anyone has used them before with boost please comment as to their reliability
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Is the only difference between the other deal you posted the additional $1 cashback?
https://www.ozbargain.com.au/node/750545