Check Ebay, I see them from time to time for about $100 to $150.
Here's the part number for just the DVD player, 28184-ZM00A
(old # 28184-5Z100). A new one from the dealer would be about $700.
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Titan/Armada Part Numbers
AEM intake, Banks exhaust, Up Rev tuned. Detroit Truetrac
305.5 WHP, 370.4 ft/lbs tq