Just when we thought Costco loved us as much as we love them [1], they've decided to raise their membership prices by June 1 this year. Costco Wholesale Corporation's shares fell more than 4 percent, contributing to the change that will affect about 35 million members.

Annual memberships will increase by $5 to a total fee of $60, and executive memberships in the US and Canada will go up by $10, with a new fee of $120.

Though Wall Street was disappointed by the Washington-based company's [2] quarterly numbers, we have a feeling that loyal customers will now be, too.