According to a mobile site that Nokia had the Lumia 920 will be $149.99 on AT&T. Clicking on this link while on a mobile phone gives you the leaked price; however, I am not sure it is still working. While reports of the release date have not yet been confirmed, sources close to AT&T have told wpcentral that Nov. 9th may be that day. Also other rumors point to Nov. 11th.
There may be another scenario, preorder on the 9th, launch on the 11th? As of right now no one knows for sure. Keep checking back and as soon as anything new comes out from AT&T you can find it here.