For those who own a Nexus 10, where did you buy it? It appears market price is $399.99 for the 16 GB and $499.99 for the 32 GB. So I was a little surprised to see Amazon list them about $50 more than that. I was hoping to go through Amazon for free shipping and no sales tax. Did anyone purchase the Nexus 10 for the actual market price without having to pay shipping and/or tax?