The guitar listed on the Costco website is a single guitar that was signed by Conor Oberst after an acoustic performance in New York on September 16th, 2005. Due to an internal mistake at First Act the guitar was put up for sale on the Costco website.
first act
UPDATE: Costco "Conor Oberst" Guitar Was Authentic, Sold By "Internal Mistake"
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4.12.07