For today only, everything, and I mean everything (all THREE items) is on sale in the FlowingData shop. Currently available: the Famous Movie Quotes poster, the Chart-Topping Songs poster, and a signed copy of Data Points.
Buy any one item and get the second for 50% off (discount code: CYBER50). Buy any two items and get two for free (discount code: CYBERFREE2). It works with multiples of the same item too. Just enter your code at checkout.