i am looking at a used d90 on ebay and it is a very good price. however the listing says " made in hongkong" does this mean it is gray market? it says there is a 4year warranty avaiblie with it and also the seller has 100% feedback. it is selling from australia though. i am in america, it should still work fine right? is there anything else i should worry about when buying used camera's on ebay?? thanks!