Costco’s new Tide detergents are the cheapest detergent on the market, with prices ranging from $3.99 per bottle at its flagship stores in Minneapolis to $5.99 for its smaller locations.

The costco products, which are the same as those found in Tide’s other grocery stores, include three- and four-pump systems that let you mix the detergent in smaller bottles for a few cents more per gallon.

(In comparison, Tide’s priciest product is a $5 gallon of water that comes in a plastic bottle that cost $4.99.)

The Tide product line is the latest move in Costco’s evolution into a more environmentally-conscious business.

In May, the retailer announced a partnership with a nonprofit to create clean laundry detergences that use only organic ingredients.

It also announced that it would no longer use fossil fuels in its operations.

(The partnership was announced in August and is still ongoing.)

In addition to the Tide line, Costco has also expanded its eco-friendly offerings with a new line of laundry products called Green.

The eco-conscious products include the Tide brand, which uses recycled and compostable paper and packaging to make detergent.

Green detergent is made of cotton and coconut oil, and is made with organic, biodegradable materials.