The Mormon Tabernacle Choir's "Glad Christmas Tidings" is now available at Walmart and Target stores nationwide.The choir has just launched a new Facebook promotion exclusive to the Choir's Facebook fans to get a free autographed copy of the CD, personally signed by David Archuleta.Here's how to enter:Step 1. Visit your local Walmart or Target and purchase a copy of "Glad Christmas Tidings."Step 2. Take a picture of the CD and/or DVD with identifying store signage in the background, and accompanying receipt.Step 3. Go to the Glad Tidings Photo Contest (https://www.facebook.com/MormonTabernacleChoir?sk=app_206771522697372) on the Mormon Tabernacle Choir Facebook page, submit your photo and share it with others.The contest is open from Dec. 5-18. They'll choose 10 winners and notify them on Dec. 19.