+1 @yogiboy I was just going to say, HiFi Shark and its notifications do exactly this, but across multiple platforms (USAM, eBay, Audiogon, etc).
Audiogon Tech Question
I wanted to save a search for an item that is not currently listed on Audiogon.
When there is an item for sale, I have the option of saving the search and getting email notifications.
If there are no items listed, there isn't the option to save the search. Which seems like a more important time to save one, since the item is rare...
Any advice or tips?