Abstract: A repricing system calculates new prices for goods based on pricing data received from a plurality of sources and updates the prices of the good. In an embodiment, a pricing engine determines a market price based on the pricing data and calculates a new price for the good based on the market price and seller repricing instructions. In another embodiment, the pricing data comprises prices of used versions of the good and/or the distribution of prices of the good. In another embodiment, repricing is triggered by the elapsing of a predetermined interval of time. Using an embodiment of the invention, a seller can automatically recalibrate her prices on a regular basis.