Hobby King and Hobby City are the same company. If there are any other clone sellers, they get the stuff from the same place so the chances of finding them in stock anywhere is slim.
You really have two choices... Pay normal price for Spektrum or wait however long it takes to get the clones.
Advantage http://www.advantagehobby.com has free shipping on most orders over $50 which saves a little compared to buying from Horizon.