If you want ammo from WM you need to be there about 6:45am for 7am opening sales and hopefully you are ahead of the ammo sharks. I have seen the same group of guys in the Norman locations multiple times and they all talk about their latest finds and how it should be a nice payday. I was first and turned down 3-100 pack of Winchesters recently, on hindsight I should have grabbed them and posted them up here at cost to spread the supply.
I haven't seen near as much over-priced 22lr ammo selling here lately. If folks can just hold off it should start to relieve the problem. I'm pretty sure the Zombie Invasion isn't scheduled for another 5 or 6 years.