The bakery is switching to smaller muffins and will no longer offer mix-and-match muffins. Instead of mixing and matching two 35-ounce six-packs of the larger muffins for $9.99, warehouses are selling one 31-ounce eight-pack of an individual flavor for $6.99.

Costco loyalists are known to rave about everything from the food court (with its decades-enduring $1.50 hot dog deal) to the chain's line of exclusive, high-quality Kirkland Signature brand grocery products and even cheap booze.

Along with the disappointing rise in price, customers who have sampled the new muffins are claiming that not only are they smaller than the old ones, they also do not taste as good. In response to the price hike, one commenter asked, “are they justified?”