TheKnifeExchange.com A great site to buy and sell your knives, they update daily. Got some sweet deals there.
Install3dtv.com I used this site to get an audio video system delivered and installed. Great service but they are currently in the great Atlanta area only. They really saved me as my car wasn't big enough to get the big screen in. They shopped the delivery and installation for me at no cost. Great service!
HeadphoneExchange.com I love Grado headphones! They take trades! Never heard of that before. I had some old ipod headphones and they gave me credit (a lot of credit!) towards a pair of Grado RS1i's! Got a steal of a deal, highly recommended!
The above is a link to Reverb.com it's a very well run auction site like the bay except when it was good. They are music instrument related. I have a few items on there to see how it goes. I hope they are successful !
AmericanVintageSound.com Here is a website that is for sale. I had considered using it for high dollar vintage collectible guitars and amps. Now available please inquire if interested.