Costco is known for its membership perks, many of which extend beyond the four walls of the store, like cheap gas, vacation deals, and insurance policy discounts.
Costco members can buy a two-year, all-club, 24 Hour Fitness membership package for $399.99, according to Reader's Digest.
The membership works in much the same way as the other products Costco sells in-store: members buy in bulk to get the savings.
These membership perks are one way that Costco attracts and retains members.
Cheap gas and travel deals are used in a similar way.
According to a survey done by Oil Price Information Service (OPIS) in March 2017, Costco beat out major gas chains, as well as warehouse-club rivals such as Walmart-owned Sam's Club and BJ's, to rank as the cheapest place to buy gas in the US.