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So I order the most expensive item and pretend I never received it.

I guess need a delivery trust component. Vendor should send only with tracked/signature required service and provide receipt as a proof of shipment.

What if they send a box of dirt, and call it a PS3?

You don't even need to shop online for that - it can happen in brick-and-mortar stores: http://consumerist.com/2007/10/best-buy-sells-you-a-box-of-b...