I have gotten to be friends with my local Walmart folk in the sporting goods department some of them for 20 years.
They are good people and kept me posted through on ammo availability through the 2009 Obama induced shortage.
After the run on AR15's in December I heard a rumor they (Walmart) were either getting out of guns again or even ammunition.
They assured me that they were expanding their selection and the ATFE were coming for training in January, 2013.
We will see what happens.
P.S. The had Bushmaster's in stock before Sandy Hook but they highly recommended the Windham AR15 for about $200 less.
Richard Dyke, the founder of Bushmaster sold out a few years ago to Freedom Group.
His anti-compete agreement ended last year and he is now the proprietor of
Windham Weaponry, Windham, Maine.
http://www.windhamweaponry.com/