Tickets to the LOTR Marathon are still available in some locations neighboring major markets: Bakersfield CA, Williamsville NY (near Buffalo, also good for all you Toronto fans), Mobile AL, several towns in Lousiana, and other locales. For those of you willing to sit 9 hours in a theater, maybe a 3+ hour drive TO the theater is not out of the question. P.S. For most of the 100 locations, tickets DO remain for the EE individual showings. Check with your theater.
UPDATE: Henderson NV is now confirmed sold out.