With the authorization provided to the US Mint under Section 8 of the San Francisco Old Mint Commemorative Coin Act (Public Law No 109-230 [GPO: Text, PDF]) expiring, sets and rolls containing the 2005 Westward Journey Nickels are no longer for sale. If you missed the opportunity to purchase these items, you will have to find them in the secondary market.
If you are still looking for nice collectibles for the Westward Journey Nickel series, the Mint continues to sell the First Day Coin Covers for the 2004, 2005, and 2006 nickels.