Actually I think posting on craigslist should be worth a try too.

also the recycler
http://www.recycler.com/
should be good too.

On that note what about web adds on ENT sites. Like the ones on the forum. are they expensive? maybe on stem cell sites too.

I also think we should be calling and mailing ENTs. The good ones should put them in their lobby. Just a nice looking flyer.