I applied online but had a sibling who works for costco talk to the hiring manager, and she called me within minutes of hearing I applied. Costco is definitely the place where you need to either A. have an inside connection or B. Call or visit the store to talk directly to the manger in order to score an interview. I went in for my interview and they give everyone three different interviews but they decided to do a 2 in 1. Basic questions of why pick Costco and the standard scenario questions were asked. They also ask to see if you're able to accept some of the hard physical labor involved with being employed there. PS. They are big on customer service, even when the customer is dead wrong. My third interview was good, they asked the same questions essentially, it literally took 5 minutes.
Afterwards, i did a drug test with a cotton swab in the mouth. Then was told to report to work the next week. Simple as that :)