Just browsing their website, it appears these probably get the To Kalon declassified from their single vineyard blend. The Blend 25 is only 2% To Kalon, according to the data sheet. To Kalon is actually a pretty large vineyard, close to 100 acres. But the high demand for its fruit still seems to drive high prices for the finished wines.
Edit: Blend 24 is 8% To Kalon, via data sheet.
Edit again: Blend 24 is priced at $38, Blend 25 at $49 on the data sheets.