Hey Steve,
Sorry for your loss, that's a pain in the butt, those are expensive lenses.
The only other site I could suggest would be craigslist.org. If you're not familiar with them, they have classifieds for almost all the major cities in the US. Unfortunately there are some unsavoury characters who utilise it.
I heard about a similar situation with another person, they stated they were going to check pawn shops and the like in their area. It might even be worth it to check out anyone who might sell used photography equipment in your area as well.
Good luck!
Kate
