I love hardanger fiddles. Different tuning usually, but that depends on what you're going to play. Each district have their own tuning, pretty much. The bridge is almost flat on top, which make it easy to do double stops and quadruple stops. 

They are kinda rare these days, so not uncommon for them to go for above 5000-6000$. But I think you can get a fiddle from China for less. They don't make them the traditional way though, instead make them as Guarneri or Stradivari copies with 8 strings. I know that fiddleshop sells strings for Hardanger fiddle, but I can't think of any stores that sells instruments online.

Found this the other day. Traditional Norwegian folk dance accompanied by old school hallingfele (different name for the Hardanger fiddle.). Typical use of the hardanger fiddle.