RE: HobbyKing US Warehouse
From the home page, there is a link on the bottom right for the warehouses. The [link=http://www.hobbycity.com/hobbyking/store/US.asp?HobbyKing_USA_Hobby_Warehouse]USA [/link] one has less than one page of stuff (all planes).
I notice the EU one has 9 pages (still not a lot) and lots of batteries etc per above comment.
in terms of price, the F4U Corsair (first one on the page) is $10 more versus HK pricing (US dollars).
Obviously, planes (heavy and large) and LiPOS (hazard) would be top on the list for advantages.