Rocker Repair

So. Turns out my car has some pretty significant rocker panel damage. It's only on the driver side, but stripped the paint off and started rusting the metal. I don't remember crashing into anything that badly. Guy who did the estimate for a local body shop thinks that since I street park, perhaps a snowplow in the winter pushed some ice or something into the car. (I did have to dig it out many, many times.) The estimate comes out to ~$700 from an independent shop (haven't checked a dealer or other shop), but they can't see it until June 2nd at the earliest. :(