This is a non-Hallmark Tree Skirt ornament that was available exclusively at Star Trek: The Experience at the Hilton in Las Vegas (1998-2008).
Star Trek: The Experience Tree Skirt (#703307)
Hallmark Star Trek Ornaments
Collecting the Future
Hallmark Star Trek Ornaments 
Is this available?
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This was only available at Star Trek: The Experience. You may be able find one secondhand. Hallmark introduced Star Wars and Peanuts tree skirts in stores this year. I wouldn’t be surprised if a Star Trek skirt follows next year.
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