I just went to my local SUPA IGA and saw that the 6 Pack UP & GO is below half price, I didn't see it in the IGA catalogue but hopefully others can check their local SUPA IGA supermarkets and report back if it's on special and rebel labelled.
This is the best price I've seen for 6 pack up & go with the potential of getting a $10 rebel promo sticker and faster to redeem as it is limited to 1 redemption per day.
Thanks OP :)