The semi-original idea I wanted to bring to the table was the notion of a closed circle of trusted people. Imagine a Craigslist where you felt you could trust everyone because you either knew them, or they were a friend-of-a-friend. That’s what I’m going for.
To that end, Internet Garage Sale is invitation only. Except for the occasional hand-out of free invites, the only way to get in is to be invited by an existing user. That’s step 1.
Step 2 is you have to pay a one-time activation fee, currently US$ 5 before you can bid on or sell any items. (Browsing is free.) This pay barrier is intended to keep out scammers, spammers, and other deadbeats.
(Link: Internet Garage Sale)