We know that Nokia Lumia 930 is similar to Nokia Lumia Icon which is Verizon exclusive. Therefore, Nokia will not launch it offcially in the US. However, if you are not interested in buying Lumia Icon under the contract and you are tempted to buy Nokia Lumia 930 in US then local online retailers can help you.
Expansys is the first online retailer in US which is selling Nokia Lumia 930 in US for $699.99 and that too without any contract. Though you might find the rpice somewhat at the higher side but it will get down with time and looking at the specifications it still looks a pretty good deal.
And yes before buying this beautiful device make sure to match the 3G and 4G bands with your provider. Make sure that your carrier supports the bands otherwise you will not be able to use 3G and 4G on Nokia Lumia 930 in US.