Danger, Will Robinson!!! Fiddle shopping in the dark can just as easily yield a 350 dollar actually worth 2500 dollar find of the century or warped splinters held together with epoxy.
If you know fiddles, then go bravely forth and good luck.
If you don't, team up with a fiddle-head(No, not the vegetable) and go with a guide.
Read up what you can about fiddles, too. There's a lot out there online to read.