I bought the one below from a turkish seller, recommended on another fuse thread. I did try it with a supposedly good external amp but could barely hear any difference from the Fuse on its own. That said, I'm sure there are amps out there that can make an improvement.
My future plans are to use a Windows 8 phone + external amp/ DAC, so maybe I've wasted my money buying that LOD.
I have the fuze in my rucksack permanently because its so light and diminutive. It sounds great either through my sony buds or Ultrasone Sig Pro's.
I also saw there was a Hong Kong seller on ebay who sells LOD for Sansa Fuse.
Have anyone bought from him?