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Is there actually a demand for this? If a loved one passes away, are you looking online to save a few bucks? What happens if there's a problem with shipping and your casket doesn't get there in time - are you delaying the funeral services? Of course you could always be pre-planning your funeral and could choose to store it in your basement until you're "ready".
I think the most unusual thing that I've purchased online myself is about 1,000 gallons of oil fuel for my house. It was actually pretty simple through a site called PriceEnergy and ended up saving me a couple hundred bucks this year.
My top 5 list of other unusual items you can purchase (in no particular order)