The two leads seem essential. TL-21 alligator clips and TL-22 tweezers. Both are set up for the 4 wire measuring.
I wanted the infared to USB accessory to learn about the logging software for batch sorting. That's the most expensive accessory. I went ahead and got the power supply adapter too... it's $10.00 when you bundle it in. There is a shield wire that is bundled in also... you can make that your self anytime you think you need it.
If you want to learn details I suggest searching the
http://www.eevblog.com/forum/testgear/ for threads about the DER DE-5000.
The USA package is the IET DE-5000.
I don't know how customs works for small purchases like this. I occasionally get small electronic parts direct from China and they just show up at the door. I got some direct from China microphone clips through Amazon just last week. I figure if this purchase warrants a customs fee I'll gladly pay it.