If you have $175,000 floating around, the Apollo 11 Lunar Landing Sequence—"each page inscribed and certified as flown by Buzz Aldrin"—could be yours. Don't have that amount in the bank? I hear you.
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Don't worry, you can spend all your $90,000 on an Apollo 11 Lunar Surface Star Chart, used by Armstrong and Aldrin to determine the Eagle's position after the landing on the Sea of Tranquility. Or just buy a cool model of the Saturn V for $15,000, and use the rest of your money on dehydrated chocolate ice cream and fake astronaut hats. [Bonhams & Butterfields]