Midwest: the "gun bug" first bit me well into middle age. Did Russian etc 7.62x39 quadruple in price over about six years due mostly to simple popularity of the (good value) guns, or did people simply stock up to avoid paying much more later?
I think the 7.62 X 39 went up in price for a few reasons...Inflation (silver cost $5 a ounce, Gold under $400 in 2002) , the political scares 'guns/ammo will be banned' hype of 2008 and early 2009 and generally there is less to go around today IMO.
Forgot to mention that .38 special ammo was selling for $5.99 a box some 10 years ago or so at Dicks Sporting Goods. SKS's were selling for $99 in 2002.