Manufacturers don't manufacture such components without any orders. If I want 1K of the WM8716 IC it takes several weeks before Wolfson can deliver my own production run. The world wide 'off the shelf' stock might be less than 100 pieces at any one time. In years gone by, IC manufacturers would make huge quantities of chips, only to find them out of date or out of favour within next to no time. So now they are more careful.