I am a regular shopper of https://amazon.com. The things that make amazon different and best from other online portals is amazing customer support. They are very good in providing response as per the satisfaction to customer.
I recently ordered a Himalayan baby kit with the option of 2 days guaranteed delivery as I don’t have much time and I have to present that to someone.
I got the delivery of product within 24 hours, though it was guaranteed for 48 hours.
The only problem is that sometime amazon charges a bit more than other portals but If you see the service that amazon is giving. Its totally worth it.