It's free. Just takes a few minutes / day, but honestly, I think it's been going great the past few days without me advertising. It now has over 1,090 members since I posted this thread 2 days ago and only had 720+ members.

By the way, if anyone's wondering..

This will end when I get a bid I'm satisfied with.

It's not really an auction. Just open to and considering offers lower than BIN.