which part is missing?
bfivelover,
if the front most of the shields is missing, that would explain the dragging and other issues. The three panels underneath the engine compartment interlock into each other like puzzle pieces. If one is missing, the others will not stay up!
Then there are two more, long plastic panels under the rear of the car, one each on the drivers and passengers side. Those are the ones that easily scoop up snow and sleet and peel off.
As for the price, it does sound high. One of the pieces is metal, that may be more expensive.
I just had one of the rear panels replaced (passenger side). The total came to $267.88 ($184 for parts, $74 for an hour of labor). The panel itself was only $109, but they changed all the fasteners, since a lot of them are plastic clips that break easily.