example highest asking prices:
brick
http://www.bricklink.com/search.asp?itemID=80341&colorID=5
technic
http://www.bricklink.com/store.asp?p=RAPIDOS2&itemID=62039168
tire
http://www.bricklink.com/store.asp?p=PlanetBrick&itemID=66123557
slope
http://www.bricklink.com/store.asp?p=fravelli24&itemID=72711991