Eden's Legacy Promo Set

Does anyone know where to buy a promo set for the Eden's Legacy storyline??

Yes.

Your FLGS (friendly local game store) can order them from their normal distributor.

http://www.white-wolf.com/vtes/index.php?line=news&articleid=1157

2922: VTES Eden’s Legacy Storyline Kit (for 5 players) $10

You can also acquire it online from a number of stores, like:

Walch & Nusser (if you are in Europe)
http://www.vtes.de/catalog/product_info.php?products_id=421
http://www.vtes.de/catalog/product_info.php?products_id=420

or Lasombra (out of stock until Tuesday)
http://www.thelasombra.com/sales.htm