I just got an offer from Aeroplan to earn points by buying specially marked boxes of Tropicana, and then entering the numbers on them into my Aeroplan account.
[Forget for a moment that they promised to only send me relevant and important e-mail...how do I untick "juice offers"??]
This feels very new and innovative. No idea if it will work, but I suspect they have realized that we're not cashing in coupons the way we used to, and they're trying something new. Now if the store could just do this on my behalf somehow, we'd really be cooking here.