An empty tank on our
Scamp weighs right at 18 Lbs and the government has put strict restraints on shipping and/or mailing things with flammable gas inside so in order to trade you would have to find someone within close proximity to where you live or it would be to costly.
Look at Camping World to see if they have a smaller tank or try a camping dealer to see if they would make you a deal on your present tank.