
To optimize your own sale, check out the Junk Gypsies Garage Sale Wars: http://www.youtube.com/watch?v=T6mKFoMYJ_w
https://www.facebook.com/pages/McKinney-Online-Yard-Sale/330795266977077
https://www.facebook.com/yardsales.mckinney.tx
http://yardsales.net/mckinney-tx/
http://www.pennysaverusa.com/classifieds/usa/index.html
This one also has an App:
http://www.tagsellit.com/yard-sales-in/Mckinney/Texas