I found some bike shops selling cheap aluminum frames for around $100-$200. The thing is that they're pinarello dogmas, cervelo r3's, even found some orbea and fuji frames. Pretty sure they're all fake though. The question is, should I steer clear of these frames? A lot of guys use chinese carbon frames, what's the difference with chinese aluminum?(i'm assuming the frames were made in china)

If i were to buy one and build a cheap bike with okay parts for training rides, would it end up really bad?

thanks