I made a site that searches all the major sneaker marketplaces like Kixify, SoleCollector, FlightClub and Ebay to help you find sneakers.http://www.itstheshoes.com/
It also searches through the sneaker marketplace here too.
You can bookmark searches, so say your looking for the cheapest price for the new Jordan 8s, just type bugs bunny in the search box, press enter. After the the results come back you can bookmark the page.http://www.itstheshoes.com/?page=0&s=bugs+bunny
Just keep checking back on that page to check all sneaker marketplaces at once.
To promote the first week that its up, I put together a contest on Woobox for a $100 EastBay Gift Card. You just need to like the Facebook page.http://woobox.com/khj46n
I'm still pretty new to the sneaker game, so any feedback you have on the site is very much appreciated A size filter gets requested pretty often, that is coming soon!