More info- just went to sobeys and got an amazing combo
7 sobeys gift cards for $200 each + coupon for 100 airmiles with the purchase of $200 in sobeys gift cards, for 700 airmiles
$1500 (3*$500) in Air Canada gift cards for $1350 @ 10% off
And paid for with my amex platinum, so points there as well
Great combo.
Safeway has a limit of 5 x $200 Safeway gift cards per day for the 100 airmiles offer so you would only get 500 airmiles assuming Sobeys has the same daily limit.