Thats probably true. I never looked into actually buying one. I generally assumed that the U.S. government owned the technology on much of the equipment, so no one get get that stuff.
It is amazing what one can legally buy with enough money and willpower.
http://flightplanet.com/aircraft-for-sale/aero-vodochody/l-39-albatros__2085.php
At that, if you have a few hundred million sitting around, you can buy a British Type 42 Destroyer.
http://bfbs.com/news/worldwide/type-42-destroyers-sale-online-59660.html