Edit to add:
Ugh, I must be on a Rexall high and did not see the Sobeys part. Also, I did not see Donald My Hero's answer. This info is still useful so I'll keep the post:
You don't need to register for any of these, but you should take advantage of the stacking ability while it lasts.
There is the email coupon offer that damo posted (thanks again damo)
http://images.rexall.ca/newsletter/2017/May8/MAY8-COUPON-4060-ONMB.pdf for spend $40 get 60 Air Miles
There is the receipt coupon for spend $25 get 50 Air Miles (no screen shot) that you can get when you shop on the weekend (Friday, Saturday and Sunday) and DO NOT meet the flyer bonus. Karate is next door so I head in and buy a box of tissue on the weekend. The coupon is printed on the bottom of the receipt.
There is the survey coupon offer
http://couponscanada.smartcanucks.ca/get/rexall5-coupon-canada for Spend $25 get $5 off.
There is the Load & Go offer that will be exclusive to your Air Miles account. You have to load it here
https://loadandgo.airmiles.ca/#/guest/login
And now there is the Mega Miles get 15 when you spend $25 (in the booklet or online
https://www.airmilesmegamiles.ca/en/region).
I stacked all of the above at a shop today and got 232 Air Miles for $41.93 spend before taxes plus $5 off which almost covered the taxes.
That's over $23 worth of Air Miles plus $5 off. To be clear, I'm not buying things I would not have otherwise. And all the items were well priced sale items.
I've said it before, I love Rexall with Air Miles. Their regular prices are awful except for staple grocery items (which is my staple Rexall item).
Once you do all the above once, it will all click for you. Don't over think it. Just print all the above coupons and load your Load & Go offer. Next time maybe stop by for a box of $.69 cent tissue on the weekend to get another 50 Air Miles on next week's shop.