Unionized Costco stores in the U.S. voted to authorize a strike. Here's everything to know about possible Costco strike locations and Arizona impact.

With a master agreement with the Teamsters set to expire in 10 days, affecting 18,000 of the retailer's workers, hundreds last week held practice pickets.

The International Brotherhood of Teamsters, which represents more than 10,000 Costco workers, authorized a nationwide strike to occur in February.

Thousands of Costco workers nationwide voted Sunday to authorize a strike if a contract is not reached by the end of the month. The authorization was approved by an 85% margin due to Costco’s “failure to bargain constructively and refusal to present a fair contract offer that reflects the company’s record-breaking profits,

Thousand of Costco Teamsters across the U.S. are preparing to strike by the end of the month if the company does not present a "fair contract offer," the union says.

More than 18,000 Costco workers will be walking picket lines in less than two weeks if a labor dispute over wages and benefits is not resolved, according to the Teamsters union. Members voted by an 85% margin to authorize a strike when their current contract expires on Jan. 31, the union announced on Sunday.

At practice pickets in Sumner, workers held red, white and blue signs with the words “Strike Ready! A taste of what’s to come!” and “Just sampling.”

The more than 18,000 Costco Wholesale employees represented by the Teamsters union voted overwhelmingly to authorize a nationwide strike should they not reach a new labor agreement by the end of the month.

Workers at America's largest wholesale retailer may soon go on strike as the corporation has seen profits skyrocket in recent years, union officials said.Costco workers nationwide voted by an overwhelming 85-percent margin to

Teamsters for Costco Wholesale voted to authorize a strike ahead of an agreement ending on Jan. 31, the union group announced.

The union, which represents more than 18,000 workers at Costco, said 85% of its members voted to authorize a strike.