Northlanders get a chance to buy and sell used bikes while supporting United Way of Greater Duluth. It's held each year at Continental Ski & Bike, 1305 E. 1st Street in Duluth.
More info here:

Continental Ski & Bike owner, Bill Howard said, “The swap is a great way for families to stretch a buck and we’re excited to be a sponsor. It’s also a great way to promote healthy living and helping the community through United Way.”
For more information, contact Continental Ski & Bike at (218) 728-4466 or give us a call at United Way of Greater Duluth at (218) 726-4770.
7th Annual Bike Swap date: April 20 & 21, 2013