Hi Sam,
We currently don't have a space for selling and trading dev boards and tools, but that's not a bad idea. I will take it to our community council to see what they think. In the meantime, no one would stop you from posting here anything that you might have available related to i.MX. Just do your bartering off-line (email, private discussion, etc) so as not to distract other members.
Thanks for the idea.
Regards,
Grant