I recently bought some Iraqi currency (Dinars) as an investement. The price is low and I believe the return may be high...Time will tell.
I bought mine here: http://buyiraqidinars.com/
This other site is more informative but cost more. http://betoniraq.com/wnd/
He was fast to ship and respond to my e-mails. I had no problems and plan to buy some more later.
Here is what the 25000 Dinar note looks like: