Costco carries 2 pancake mixes.
2 pancake mixes from Costco
I didn't know which pancake mix to purchase, so I got them both. But, clearly, I had a higher expectation on the expensive yet smaller pancake mix by Coach's Oats. Per pound, the Multi Grain Pancake Mix was 4 times more expensive than Buttermilk.
Krusteaz Buttermilk (cheaper, bigger one) has a classic pancake house taste. This is a solid, good pancake. You will not miss out on anything.
Coach's Multigrain Pancake mix is different. You may find this too fancy for your taste. I can tell this pancake mix is high class with a lot of grain. It's grainy and breaks down easily. This doesn't have that classic taste. It's a very good pancake mix. It's richer and fancier compared to Buttermilk. But if you are craving for that classic pancake-house taste, this is not for you.
Personally, I am happy I got them both. My next purchase will be the 10 Pounder (cheaper). I like the price, taste, and the fact that it doesn't require egg to prepare.
Update (May 24, 2011)
I don't always see Coach's Oats pancake mix at Costco. But they periodically bring them back in stock. So, watch closely when you are at Costco.