Dollar Tree said last month that it would add coolers for frozen and refrigerated foods to 550 stores this year, which is more than it has ever added in one year. Coolers were added to 215 stores in the company’s second fiscal quarter, and it now has coolers in nearly 3,000 of its 4,842 locations.

Coolers in dollar stores are significant, of course, as it allows them to increase the amount of grocery items they carry, and allows them to compete head to head with traditional supermarkets, discount grocers and other retailers that sell food.

Net income for Dollar Tree in the second quarter rose 4.6% to $124.7 million on sales of $1.85 billion.