http://www.bricklink.com/catalogPG.asp?P=3068bp07&colorID=3 is the blacktron tile. looks like prices have gone down.
here’s another ridiculous oddity of bricklink. Not only is the price of a dark blue 1 x 8 x 2 arch ridiculous due to being in modulars, but check out those used avg prices versus new. It’s ludicrous!