Gogamer has Dirt 2 for the PC for $7.90 + $2.99 s&h = $10.89 shipped.
Dirt 2: http://www.gogamer.com/viewproduct.htm?productId=89482873&categoryId=65193
Next lowest shipped or B&M on Google Products: http://www.google.com/products/catalog?q=Dirt 2 for PC&hl=en&cid=11013168700108751860&ei=rvyJTMe8NpSG2QTs6bS_DA&sa=title&ved=0CAcQ8wIwADgA#scoring=p
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