Take into account the cost of servicing the movement (which is likely to be necessary) and you're coming up on the price of what that $150 movement would have cost anyways. That's also considering that the movement is in decent working order as-is with no need to replace parts, etc.
However, if you're buying the 'brand new' movement from a parts house like Ofrei, then you need to be aware that in many cases, these aren't exactly new movements either...