U.S. and IAEA officials say they believe North Korea procured the P-2-style centrifuge designs from A.Q Khan following a barter trade conducted in the 1990s.

WSJ: North Korea Nuclear Find Raises Fears It Will Share With Iran

Note: Be sure you are comfortable with the complexities barter can introduce into your life and be up-front with your trade partner on the legalities.

FORBES: Bartering for Survival - Have I Got A Deal for You

Chasen's barter idea: Buy discounted magazine and newspaper ad pages in bulk and trade them to restaurants for dining credits, which would then be sold to diners for cash.

FORBES: No Free Lunch