Best Buy stores near my home don't always have the items stocked that their website claims to have in stock.

I rarely notice sales on Kindles in any of the local retail stores. I think the profit margin is so low they seldom mark them down, but occasionally they do.

If you have trusted relatives or friends in the USA near where you are traveling you could order one through Amazon.com and have it delivered to their home. Otherwise online ordering would be very problematic.

When you get here, go to Google.com, select Shopping (from the More drop list), and enter Kindle. On the Google search results page in the left side column scroll down and check the Show Only box for In Stock Nearby. You will get more store ads than you would normally care to read. You would probably have to do this after you arrived in USA so that Google will see you are here and direct ads accordingly. I have no clue as to how accurate these listings are.