I've shopped at Costco for over a decade. Here are the 8 biggest mistakes I see customers make.

Source: Business Insider

Costco is a great chain to affordably buy products in bulk. Olivia YiI've shopped at Costco for over 10 years, so I know a lot of the rookie mistakes to avoid. Knowing how to read the chain's price tags can help you make smarter purchasing decisions.