D-man, if you are finding WRX's MY98 or older with less than 100k on the clock I would be getting them checked out. Especially if they are charging "around 13k" for them. Whole dashes can be swapped out for newer dashes from wrecks with less kays. If it seems to good to be true mate, it usually is.
Is you do decide to buy one, follow pmh's advice, what he said makes good sense.