Pasadena online power-tool retailer CPO Commerce has been acquired by United Stationers Supply Co. of Deerfield, Ill., for $30 million. The price tag could reach $40 million based on company performance.

United Stationers Supply Co., a wholesale distributor of business products, is a subsidiary of United Stationers, which is traded on the Nasdaq stock exchange.

CPO said in press release it recorded $78 million in revenue last year.

The e-commerce retailer also operates brand-specific sites where customers can shop for tools made by companies such as Bosch and DeWalt.