I found my x on ebay, right here in the same county i live in. I would not buy anything i couldnt put my hands on especially one of these cars, Just too many hidden issues to look for, hidden oil leaks, cv boots, window regulators, vacume leaks that may only cause a slight problem every other startup,sounds from under the engine that might tip you off to a problem just to name a few. From what i know now i would be looking to see what had been replaced cause if it hasnt been you will be and that would factor into my buying price. As for an inspection i would suggest a bmw specific mechanic. I have found regular mechanics that arent used to bmws will miss a lot of the bmw specific problems. Read this forum for a lot of valuable information then go put your hands on an x before making the purchase.