It was my understanding that they're free, as it's community-based mapping. You can download the SDK yourself and start building.
Left 4 Dead Map Database: Maps
Dawn of the Dead, anyone?
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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