20 in rims off ebay

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hey guys im thinking about odering some tires and wheels off ebay i found this company in miami that will sell me the 20 in rims with tires for 1800 brand new i have 19 in rims right now and was gonna buy tires but the tires are like $1600 i know there not oem but the guy says there indentical and bmw dealerships buy off them they also come with yokohamas what do you guys think or is ther somewhere else i could buy some rims and tires maybe even if i could get better deal on some 19 in tires so guys i would really appreciate your guys input i dont want to get ripped off and end up buying junk rims thanks