This article is from the Toys FAQ, by firstname.lastname@example.org (Scott Gordon) with numerous contributions by others.
You can trade one "rare" figure for another. If you run across a
figure that others are looking for, yet you still cannot find the
figure you are looking for, you can post a trade request and
chances are someone will have what you are looking for and will
want what you have found. The best and fairest of these type
trades are ones where the cost, and not perceived value, are equal
on both sides. And if your attempts at trading the figure are
unsuccessful, you can always return it to the store for a refund,
or sell it at cost so that you are reimbursed and someone can
acquire a figure they are looking for.