Why don't you check! GameStop have been sending out emails over the past few days, tipping customers off to the fact they'll be open at midnight for the launch of Metal Gear Solid 4. Only catch: not every GameStop will be open. Just some! And by some, I mean hundreds. Their list runs for 29 pages, so if your local store (or at least, a store near you) isn't on there, you may wish to consider your geographic isolation, and ask a friend via telegram or carrier pigeon to pick a copy up for you.
Metal Gear Solid 4 Midnight Launch Locations [GameStop]