If anyone could give me some info on where I could find one of these cartridges I would greatly appreciate it?

If you live in the USA, your best bet would be to contact the IAA. This is their website: http://cartridgecollectors.org/

Tony Williams: Military gun and ammunition website and discussion
forum

http://www.sukhoi.com/Medium%20Caliber.htm

Jiri

Monitor the listings for collectible ammo on Auction Arms. There have been many, many of these offered in the past two years. The volume has dropped off in recent months, but I'm sure more will surface.