Oops. Where can I get a replacement light?

Backing into our camping site way after dark, Kelli spotted me on the driver's side and I didn't worry about the starboard side as it was a big spacious campsite with nothing but a picnic table.  Well, I managed to tap the picnic table with my sidelight and broke the lens.  Can anyone tell me where I can get a replacement light or, better yet, a replacement lens?  Thanks, Mark


broken light by whollyterriers, on Flickr

I bought the whole light from either Auto Zone or Discount Auto Parts=can't remember which one but it was only $4 or so and only used the lens.
George

I went to Advanced Auto, O'Reilly's and Discount Auto looking for a duplicate sidelight without success.  The O'Reilly staff recommended I try Tractor Supply. I went there and found a Blazer trailer light with a slightly different lens but it fit the base perfectly.