I've never paid attention to where they ship from.
Maybe the TN site was also out. Maybe the game is so popular, is it new, that people are keeping them longer to play. Thus the site to have one is unfortunately across the country.
Look at it this way if there was an option that specified you only wanted items shipped from the MD site your still out of luck. The site doesn't have the game. You can get it from the CA site in 3 days or it might be a week or more till the MD site even has one available to ship.
I think your complaning needlessly on this matter.