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Find grocery delivery slots on Amazon, Costco, and Instacart. Find grocery delivery slots on Amazon Fresh, Prime Now, Costco, and Instacart. Automatically refreshes and monitors delivery slots on major grocery shopping sites. Currently supports Amazon Fresh, Amazon PrimeNow, Costco (trial), and Instacart (trial). Quick guide (using Amazon Prime Now as an example): 1. After installing the extension, add items to your cart and enter delivery information as usual. Proceed to the checkout page. (You will see "No delivery windows available. New windows are released throughout the day".) 2. Click the extension in the upper right and make sure it is "ON". ("checking primenow slots" will appear below the extension.) 3. Go do something else. You can switch to another page or application, as long as you do not close that page. 4. When you hear a chime, a slot should be available. Check out quickly! You still need to be fast. If you have any questions or suggestions, you can leave them in a review. I check occasionally and fix bugs.