The white ones tend to be dearer, IMHO, which seems a little odd to me as they are much younger, no decals, and no pretty face plate (I have one as it's the first one I had a chance to buy, with the motor that works in Ireland)
I subsequently found a black one, again with the right voltage for me, but it was a 222 (with the free arm facility and the feed dogs will drop down) It's older, has the decals, but the striated face plate, not the pretty scroll one. I paid a bit more than my white one, but 222s are usually dearer again, so I thought I did well at about $350. The odd thing is that the white one seems quite sluggish to use, compared to my black one, though both produce beautiful stitches.
I think I was lucky, both times, on ebay, and that is probably because of the voltage situation, so I wasn't really up against a lot of people in the US. It's not that they can't be used in the US, but you need a voltage converter too.