You have to take in consideration that you have big shipping and customs + brokerage fees...
Shipping would be at least for 4 wheels about 200$ and you will have something like 200$ import fees/taxes...
I purchased my set of 18" GMC for the winter out of ebay, announced price was about 275$ + 200$ shipping and i got abour 80$ customs when it arrives here, keep in mind the my buying price of 275$. Price must be really good to make a deal from here in canada.
Mine costed about 550$ for a set of 4 OEM Gmc Terrain 18" wheels so the deal was good since it was costing little more than that for 4 third party cheap wheels. I was also luckey that they were looking brand new, not even a single scratch.
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Other experience, i purchased a set of wheels for my Maxima a couple of years ago and when they arrived, they was brand new, alright... when i have them installed, we found that they were all not correct, i don't know how to say that but they were not perfect so the car was shaking like crazy. And since tires was already mounted on it (installation fees) the guy from who i purchased it never wanted to refund or exchange them. So i trashed them and lost 850$. I will never purchased third party wheels again over ebay. I think i was really lucky for my winter set of wheels. But the price was really good.
I suggest you to find them locally, you will get a warranty that they are correct, and you will probably get the tire installation free.
Hope i answered your questions.
Sorry for my english, not my primary language...