For daily porridge and batch baking, the standard Kirkland Signature Wildflower Honey in the 5 lb jug is generally your best balance of value, volume, and flavor.
Wildflower honey has a richer, slightly more floral profile than plain clover honey, which means its flavor actually carries through when mixed into warm oats or porridge without needing to use huge quantities. At the same time, it is mild enough that it will not overpower your baked goods or clash with other ingredients like cinnamon, vanilla, or whole grains.
If your local warehouse carries the 5 lb Kirkland Signature Clover Honey instead, that is also a fantastic bulk workhorse for pure baking because of its neutral sweetness and smooth texture, though it has slightly less character in porridge compared to wildflower.
Costco also sells the 3-pack of Kirkland Signature Organic Raw Honey bears, which offers wonderful floral nuance, but the price per pound is noticeably higher. If your priority is regular baking batches and everyday breakfast bowls, sticking to the large 5 lb jugs will give you the most economical results by far.