Have you tried buying groceries online yet?
I am a bit behind the times (since Amazon doesn't deliver to India!) but I just bought some Finish dishwashing tablets on a deal a couple days ago. The hard thing about buying groceries online is that you really have to know what a good deal is. Amazon's "list prices" can be inflated, and are usually more than you'd pay at the grocery store. There are definitely some great Amazon grocery deals out there though!
What groceries have you bought online?