As it stands, you can get the Collector's Edition for $129.79 right now. That's up $59.80 from what you could get it for a few days ago. The price hike can easily be contributed to the demand for the Collector's Edition.
Wrath of the Lich King will be released next week at 12:01 a.m. on Thursday, November 13th. Amazon and other online retailers are "guaranteeing" that they'll deliver Wrath to you during the day of the 13th.
The regular edition of Wrath is going for $39.99. We have previously covered the contents of the Collector's Edition.
Edit: You can also order the Collector's Edition online at Walmart at the price of $69.82, however your mileage may vary.