Stocking up on diapers in Canada, tips?

Kathryn • 1st Time Mommy :)
Hi girls, I live in Canada and I started buying diapers because I personally would be more comfortable having most expenses out of the way prior to baby coming and diapers out of the way would be great for me. However, in Canada I don't see that we get many deals or offers so it seems that you basically end up paying what the regular price is, and the best value would be at costco on the huge boxes they have. Any ladies in Canada have any great tips for saving money on Diapers? Suggestions how many of what size would I need? Let me know! And if you have a stock pile share a pic I'd love to see it!