Costco will increase hourly wages to more than $30 over the next three years, but union leaders say the raise isn't enough as a nationwide strike looms.

Costco workers will have some extra money to spend this spring. The company announced this week it is raising its hourly wages for employees at the top of the pay scale to $30.20/hr and workers at the bottom of the scale to $20/hr in March, according to The Seattle Times, citing a memo to staff attained by Bloomberg News.