Err.. DAA wasn't part of the "Collector's Edition". Not in either the US or the UK release. The "Collector's Edition" had the base game and some "in-game items", but the only game-play DLC was "The Stone Prisoner".
Here's the Wiki entry:
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The Dragon Age: Origins Collector's Edition is the premium edition of the game Dragon Age: Origins that was available at $59.99 for the PC or $74.99 for the PlayStation 3 and Xbox 360. It is available without extra cost for players who purchase the digital Collector's Edition. It is a limited edition release and may no longer be available in stores.
The premium edition's contents include the game and a bonus DVD, and is packaged in a metal tin or a wooden case. It also includes codes for downloadable content that grant players access to three exclusive in-game items.
In addition, first hand owners of the game are also given access to other downloadable content - The Stone Prisoner and Blood Dragon Armor.
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And here's the Description from Amazon.co.uk:
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3 exclusive in-game items. Unlockable bonus quest and character. Bonus DVD, featuring: Making of featurette Concept art Game soundtrack Exclusive wallpapers * Advertised downloadable content offer expired on April 30th 2010.
Currently unavailable.
We don't know when or if this item will be back in stock.
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Now if you mean the "Ultimate Edition", that's a different story...