creatureofhabit,
Just wanted to tell you about my new favorite ebay tool, the "Saved searches" function. It lets you save searches, and will notify you by email when things you want come up for sale.
You could make a few pretty wide parameter searches, like "dbx 118 117" and see what comes up. I find it's better than Prepal to find out what things are selling for currently.
I also like the "Submit best offer" option, you can submit a one-time offer for a piece. The buyer can choose to end the auction early and accept your offer.