St. Louis (KSDK) - If a trip to a warehouse store is on your weekend list of things to do, you probably love shopping for deals, and can't resist the idea of getting something for free.

But you probably don't know that shoppers are known for taking offers that are bad buys, and even buying items they otherwise wouldn't have, all because they don't do the math correctly. Sound familiar?

Thomas Nitzsche with Clear Point Credit Counseling Solutions joined First @ 4 to point out the dangers of bulk shopping and talk about something called "base value neglect."

Click the video player above to hear what he had to say.

KSDK