Grocery shopping service Instacart has launched with US retailers in Atlanta, allowing shoppers to get online groceries within an hour.

Costco and Kroger have both signed up to the service, which enables shoppers to order grocery items from multiple stores and then receive them within an hour.

The service costs $5.99 for any order over $35 and was originally launched in San Francisco, and has previous announced partnerships with retailers including Trader Joe’s and Wholefoods.

Those whose groceries are less urgent can pay $3.99 for two hour delivery of a $35 order. Shoppers can also schedule their deliveries for a particular hour later in the day for the same time.

For orders less than $35, one-hour delivery costs $9.99 and two-hour or scheduled delivery is $7.99.

Instacart is one of a number of online grocery services to have cropped up in the US, including the big names Amazon Fresh and Walmart To Go.