mca,
Look at these for just under $50, if you do not want the insides then just don't use the insides for tis price.
Here is the link: http://www.speedwaymotors.com/Black-Dietz-Type-Headlights,4120.html?parentDisplayId=2948
Hope this helps and have a Happy New Year and be safe.
Just realized your on the California Caterham Club Forum and that I had posted the same thing there.