UPDATE: As mentioned below, Ecost.com has gone somewhat nuts, and is selling Metro 2033 for $26.99! Now you really have no reason to not pick up this game.
Still unsure about buying Metro 2033? Well consider yourself lucky because HKOfferhouse.com has Metro 2033 for $37.99. You can even use Paypal. Shipping is not bad, $4, but it's sent by Airmail which will probably take some extra time. Still worth the wait to save the money.