There IS NO "REAL" 7.62 X 39 SHORTAGE!
The "shortage" is a combination of three things:
1. Some of the Russian and East European manufacturers were filling LARGE orders to re-arm the new Iraqi army and police forces with Uncle Sam paying the tab. (It's easier and cheaper to buy new and know what you have is safe, than testing Saddam's old stockpiles. The remaining stockpiles that we hadn't already blown up to keep it from the insurgents, anyway…)
2. Import ammo comes in on container ships. Huge loads come in every few months, it's not a constant flow all the time. So if a panic gets going between mega-loads, there's a temporary shortage.
2a. For high-profile items like ammo, it then can take weeks more to clear customs, this slows it down even further. The pace of interantional shipping from the overseas ammo factory to the major American distributors is much different in time and scope than the 1 week it takes you to get it via UPS.
3. Unscrupulous (or smart, depending on your outlook) dealers have taken advantage of panic buying based on Internet and gun-show rumors, and have jacked up the prices on their remaining stock.
Keep shopping around, Sportsman's Guide is supposed to have some, or is at least filling orders every few weeks. Also if you're interested in paying a bit more (which you will, anyway) for S&B and the other "expensive" ammo (But still way cheaper than US) that most people overlook while scrabbling for Wolf at it's cheapest, you'll find plenty of 7.62 X 39 too.
Also, try looking for smaller lots than the large cases, you might find 250 and 500 round lots or odd amounts availible because the majority of interest seems to be on the 1000 round cases. Again, you'll pay more, but if you're terrified that "Mad Max Days" is just around the corner, you'll at least have your ammo.
The overseas ammo makers aren't stupid, they know there's HUGE demand for 7.62 X 39 in the US, it just takes time for them to get it here. The market will be flooded again, probably by the end of summer, and things will return to normal, more or less. It's possible you'll never see $99+ s&h 1000 round cases again, due to inflation and the international value of the dollar, but it'll still be "cheap"…