The original costume David Prowse wore in The Empire Strikes Back is up for auction now! You yourself can wear the authentic Dark Vader costume. You'll only need to shell out between $250,000 and $365,000. Or you could purchase one at Walmart that comes with a sweet plastic mask for $15. Either way.   
  
 

Who?

" @ArchScabby: I think he's the lead singer for Radiohead. Not entirely sure either way.  "

I remember when the Air and Space Museum had the Star Wars stuff on display, pretty sure they had this. Twas awesome. 
 
Also, you should only be allowed to buy this if it fits you. 

so can someone let me borrow about $400,000?

Someone buy it, then burn it and put the video on Youtube.

I used to remember at the lucas store, there was a darth vader costume that was a grand.