2-3 years ago (before Soarer's Converter) these were readily available on ebay and sold for $30-35 because nobody wanted them, or, at least, very few people were willing to make the effort that it took to make them useable.
Now that some of us have found simple direct methods to make them work the way we want, the landscape has changed.
In the past year or so, weeks (or even months) have gone by between seeing them go up for sale on ebay, and they usually sell in the mid-$100 range, plus or minus tens of dollars, but this is variable and unpredictable.
The thing about ebay is that you never know when a seller will have a strange item that he does not know with, and sells it off far too cheap.
It happens every day, and somebody gets lucky. Is it worth waiting a year to save $100? You decide.