Days of Wonder is distributing copies of the Necromancer Island scenario for Small World from its US online store.
From their website:
Necromancer Island, is a free, limited-edition Small World scenario originally available only from game retailers, or if you ordered a Small World product directly from Days of Wonder.
Since not everyone has been able to get a their hands on a copy of Necromancer Island, we’ve now made them available directly from the US Days of Wonder web store while supplies last. The Necromancer Island expansion is still free, but you will need to pay shipping & handling charges. You can order Necromancer Island by itself or add it to an order for another game or product.
If you are only ordering Necromancer Island and shipping to the United States, we suggest choosing US First Class Mail as your shipping option which will result in the least expensive shipping option.