Yes it is Big Al's Edmonton.
Looks like this is the rebate form:
http://www.bigalscanada.com/rebates/...bate_10-12.pdf
There's a couple stipulations on it.
One rebate per envelope, and you have to send the original invoice. This means to you have to get each pail on a seperate receipt.
Only 3 rebates per mailing address. Simple to get around, just have the rebates mailed to a friends, or relatives house.
Its going to the states, so make sure you have American Postage on the envelope!