My friend Steve says you can buy a "body in white" from South Africa for around $2500 (basically a stripped shell). I think he bought his from a junkyard for less than $1000. Figure another $1000 to ship it back, then you'd need at least a donor sedan here in the US to "finish it off". Other bits could be had from OZ ebay?

South America may be a better option, but he's originally from South Africa, so he went that way.